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Xin Huang 16663a2f5f Fix iOS 26.0 and 26.0.1 GUI boot 
Patch the 26.0/26.0.1 IOMobileFramebuffer SwapEnd payload size during CFW install and document the validated 26.0, 26.0.1, and 26.1 host-install matrix.
2026-07-08 11:28:36 +03:00

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Firmware Manifest & Component Origins

The erase install firmware is a hybrid of three source sets:

  1. PCC vresearch101ap — boot chain (LLB/iBSS/iBEC/iBoot) and security monitors (SPTM/TXM)
  2. PCC vphone600ap — runtime components (DeviceTree, SEP, KernelCache, RecoveryMode)
  3. iPhone 17,3 — OS image, trust caches, filesystem

The VM hardware identifies as vresearch101ap (BDID 0x90) in DFU mode, so the BuildManifest identity must use vresearch101ap fields for TSS/SHSH signing. However, runtime components use the vphone600 variant because its DeviceTree sets MKB dt=1 (allows boot without system keybag), its SEP firmware matches the vphone600 device tree, and hardware target reports as vphone600ap for proper iPhone emulation.

fw_prepare.sh downloads both IPSWs, merges cloudOS firmware into the iPhone restore directory, then fw_manifest.py generates the hybrid BuildManifest.

1. Multi-Source IPSW Comparison

Identity Count Overview

Source Identities DeviceClasses
iPhone 26.0 5 All d47ap
iPhone 26.0.1 5 All d47ap
iPhone 26.1 5 All d47ap
iPhone 26.3 5 All d47ap
CloudOS 26.1 6 j236cap, j475dap, vphone600ap (x2), vresearch101ap (x2)
KnownWork 26.1 5 All vresearch101ap

26.0 and 26.0.1 have no matching public PCC vphone600 drop in this repo's tested set, so it is prepared as iPhone 26.0 or 26.0.1 userspace plus the 26.1 PCC boot/runtime stack. The 26.0 and 26.0.1 IOMobileFramebuffer dyld-cache patch in CFW install fixes the only observed GUI ABI mismatch (SwapEnd payload size 0x548 -> 0x560).

CloudOS 26.1 Identity Structure (6 identities)

Index DeviceClass Variant BuildStyle Manifest Keys
[0] j236cap Darwin Cloud Customer Erase Install (IPSW) RELEASE build 37 keys (server hardware)
[1] j475dap Darwin Cloud Customer Erase Install (IPSW) unknown (no path) 0 keys (empty placeholder)
[2] vphone600ap Darwin Cloud Customer Erase Install (IPSW) RELEASE build 29 keys (includes UI assets)
[3] vresearch101ap Darwin Cloud Customer Erase Install (IPSW) RELEASE build 20 keys (no UI assets)
[4] vphone600ap Research Darwin Cloud Customer Erase Install (IPSW) RESEARCH_RELEASE build 29 keys (research kernel)
[5] vresearch101ap Research Darwin Cloud Customer Erase Install (IPSW) RESEARCH_RELEASE build 20 keys (research kernel)

Key distinctions:

  • CloudOS[2] vs [4] (vphone600ap): [2] uses RELEASE boot chain + release kernelcache; [4] uses RESEARCH_RELEASE + research kernelcache + txm.iphoneos.research.im4p
  • CloudOS[3] vs [5] (vresearch101ap): Same pattern — [3] is RELEASE, [5] is RESEARCH_RELEASE
  • vphone600ap has components vresearch101ap lacks: RecoveryMode, AppleLogo, Battery*, RestoreLogo, SEP (vphone600 variant)
  • vresearch101ap has only 20 manifest keys (no UI assets, no RecoveryMode)

vphone600ap vs vresearch101ap Key Differences

Property vphone600ap vresearch101ap
Ap,ProductType iPhone99,11 ComputeModule14,2
Ap,Target VPHONE600AP VRESEARCH101AP
ApBoardID 0x91 0x90
DeviceTree DeviceTree.vphone600ap.im4p DeviceTree.vresearch101ap.im4p
SEP sep-firmware.vphone600.RELEASE.im4p sep-firmware.vresearch101.RELEASE.im4p
RecoveryMode recoverymode@2556~iphone-USBc.im4p NOT PRESENT
MKB dt flag dt=1 (keybag-less boot OK) dt=0 (fatal keybag error)

2. Component Source Tracing

Boot Chain (from PCC vresearch101ap)

Component Source Identity File Patches Applied
AVPBooter PCC vresearch1 AVPBooter*.bin (vm dir) DGST validation bypass (mov x0, #0)
iBSS PROD (vresearch101ap release) Firmware/dfu/iBSS.vresearch101.RELEASE.im4p Serial labels + image4 callback bypass
iBEC PROD (vresearch101ap release) Firmware/dfu/iBEC.vresearch101.RELEASE.im4p Serial labels + image4 callback + boot-args
LLB PROD (vresearch101ap release) Firmware/all_flash/LLB.vresearch101.RELEASE.im4p Serial labels + image4 callback + boot-args + rootfs + panic (6 patches)
iBoot RES (vresearch101ap research) Firmware/all_flash/iBoot.vresearch101.RESEARCH_RELEASE.im4p Not patched (only research identity carries iBoot)

Security Monitors (from PCC, shared across board configs)

Component Source Identity File Patches Applied
Ap,RestoreSecurePageTableMonitor PROD Firmware/sptm.vresearch1.release.im4p Not patched
Ap,RestoreTrustedExecutionMonitor PROD Firmware/txm.iphoneos.release.im4p Not patched
Ap,SecurePageTableMonitor PROD Firmware/sptm.vresearch1.release.im4p Not patched
Ap,TrustedExecutionMonitor RES (research) Firmware/txm.iphoneos.research.im4p Trustcache bypass (mov x0, #0 at 0x2C1F8)

Runtime Components (from PCC vphone600ap)

Component Source Identity File Patches Applied
DeviceTree VP (vphone600ap release) Firmware/all_flash/DeviceTree.vphone600ap.im4p Not patched
RestoreDeviceTree VP Firmware/all_flash/DeviceTree.vphone600ap.im4p Not patched
SEP VP Firmware/all_flash/sep-firmware.vphone600.RELEASE.im4p Not patched
RestoreSEP VP Firmware/all_flash/sep-firmware.vphone600.RELEASE.im4p Not patched
KernelCache VPR (vphone600ap research) kernelcache.research.vphone600 25 dynamic patches via KernelPatcher
RestoreKernelCache VP (vphone600ap release) kernelcache.release.vphone600 Not patched (used during restore only)
RecoveryMode VP Firmware/all_flash/recoverymode@2556~iphone-USBc.im4p Not patched

Important

: KernelCache (installed to disk, patched) uses the research variant. RestoreKernelCache (used during restore process only) uses the release variant. Only vphone600ap identities carry RecoveryMode — vresearch101ap does not.

OS / Filesystem (from iPhone)

Component Source Notes
OS iPhone iPhone17,3 erase identity iPhone OS image
SystemVolume iPhone erase Root hash
StaticTrustCache iPhone erase Static trust cache
Ap,SystemVolumeCanonicalMetadata iPhone erase Metadata / mtree

Ramdisk (from PCC)

Component Source Notes
RestoreRamDisk PROD (vresearch101ap release) CloudOS erase ramdisk
RestoreTrustCache PROD Ramdisk trust cache

3. Why the Hybrid Approach

Why Not All-vresearch101?

The vresearch101ap device tree sets MKB dt=0, causing a fatal keybag error during boot:

MKB_INIT: dt = 0, bootarg = 0
MKB_INIT: FATAL KEYBAG ERROR: failed to load system bag
REBOOTING INTO RECOVERY MODE.

Also missing the RecoveryMode entry.

Why Not All-vphone600?

The DFU hardware identifies as BDID 0x90 (vresearch101ap). Using vphone600ap identity (BDID 0x91) fails TSS/SHSH signing and idevicerestore identity matching (Unable to find a matching build identity).

Solution

vresearch101ap identity fields for DFU/TSS + vphone600 runtime components for a working boot environment. The vphone600ap device tree sets dt=1, allowing boot without a pre-existing system keybag:

MKB_INIT: dt = 1, bootarg = 0
MKB_INIT: No system keybag loaded.

The SEP firmware must match the device tree (vphone600 SEP with vphone600 DT).

4. Patched Components Summary

All 6 patched components in fw_patch.py come from PCC (cloudOS):

# Component Source Board Patch Count Purpose
1 AVPBooter vresearch1 1 Bypass DGST signature validation
2 iBSS vresearch101 2 Enable serial output + bypass image4 verification
3 iBEC vresearch101 3 Enable serial + bypass image4 + inject boot-args
4 LLB vresearch101 6 Serial + image4 + boot-args + rootfs mount + panic handler
5 TXM shared (iphoneos) 1 Bypass trustcache validation
6 KernelCache vphone600 25 APFS seal, MAC policy, debugger, launch constraints, etc.

All 4 CFW-patched binaries in patchers/cfw.py / cfw_install.sh come from iPhone:

# Binary Source Purpose
1 seputil iPhone (Cryptex SystemOS) Gigalocker UUID patch (/%s.gl → /AA.gl)
2 launchd_cache_loader iPhone (Cryptex SystemOS) NOP cache validation check
3 mobileactivationd iPhone (Cryptex SystemOS) Force should_hactivate to return true
4 launchd.plist iPhone (Cryptex SystemOS) Inject bash/dropbear/trollvnc/vphoned/rpcserver_ios daemons

5. idevicerestore Identity Selection

Source: idevicerestore/src/idevicerestore.c lines 2195-2242

Matching Algorithm

idevicerestore selects a Build Identity by iterating through all BuildIdentities and returning the first match based on two fields:

  1. Info.DeviceClass — case-insensitive match against device hardware_model
  2. Info.Variant — substring match against the requested variant string

For DFU erase restore, the search variant is "Erase Install (IPSW)" (defined in idevicerestore.h).

Matching Modes

// Exact match
if (strcmp(str, variant) == 0) return ident;

// Partial match (when exact=0)
if (strstr(str, variant) && !strstr(str, "Research")) return ident;

Critical: Partial matching excludes variants containing "Research". This means:

  • "Darwin Cloud Customer Erase Install (IPSW)" — matches (contains "Erase Install (IPSW)", no "Research")
  • "Research Darwin Cloud Customer Erase Install (IPSW)" — skipped (contains "Research")

What idevicerestore Does NOT Check

  • ApBoardID / ApChipID (used after selection, not for matching)
  • Identity index or count (no hardcoded indices)

Conclusion for Single Identity

A BuildManifest with one identity works fine. The loop iterates once, and if DeviceClass and Variant match, it's returned. No minimum identity count required.

6. TSS/SHSH Signing

The TSS request sent to gs.apple.com includes:

  • ApBoardID = 144 (0x90) — must match vresearch101ap
  • ApChipID = 65025 (0xFE01)
  • Ap,ProductType = ComputeModule14,2
  • Ap,Target = VRESEARCH101AP
  • Digests for all 21 manifest components

Apple's TSS server signs based on these identity fields + component digests. Using vphone600ap identity (BDID 0x91) would fail because the DFU device reports BDID 0x90.

7. Final Design: Single DFU Erase Identity

Since vphone-cli always boots via DFU restore, only one Build Identity is needed.

Identity Metadata (fw_manifest.py)

DeviceClass     = vresearch101ap    (from C[PROD] deep copy)
Variant         = Darwin Cloud Customer Erase Install (IPSW)
Ap,ProductType  = ComputeModule14,2
Ap,Target       = VRESEARCH101AP
Ap,TargetType   = vresearch101
ApBoardID       = 0x90
ApChipID        = 0xFE01
ApSecurityDomain = 0x01
FDRSupport      = False

Source Variable Map

PROD = C[vresearch101ap release]   — boot chain, SPTM, RestoreTXM, ramdisk, RestoreTrustCache
RES  = C[vresearch101ap research]  — iBoot, TXM research
VP   = C[vphone600ap release]      — DeviceTree, RestoreDeviceTree, SEP, RestoreSEP, RestoreKernelCache, RecoveryMode
VPR  = C[vphone600ap research]     — KernelCache (patched by fw_patch.py)
I_ERASE = I[iPhone erase]          — OS, trust caches, system volume

All 21 Manifest Entries

Boot chain (PROD):           LLB, iBSS, iBEC
Research iBoot (RES):        iBoot
Security monitors (PROD):   Ap,RestoreSPTM, Ap,RestoreTXM, Ap,SPTM
Research TXM (RES):          Ap,TXM
Device tree (VP):            DeviceTree, RestoreDeviceTree
SEP (VP):                    SEP, RestoreSEP
Kernel (VPR/VP):             KernelCache (research), RestoreKernelCache (release)
Recovery (VP):               RecoveryMode
Ramdisk (PROD):              RestoreRamDisk, RestoreTrustCache
iPhone OS (I_ERASE):         OS, StaticTrustCache, SystemVolume, Ap,SVC Metadata

Full Manifest Component List

LLB                              ← PROD
iBSS                             ← PROD
iBEC                             ← PROD
iBoot                            ← RES
Ap,RestoreSecurePageTableMonitor ← PROD
Ap,RestoreTrustedExecutionMonitor← PROD
Ap,SecurePageTableMonitor        ← PROD
Ap,TrustedExecutionMonitor       ← RES
DeviceTree                       ← VP
RestoreDeviceTree                ← VP
SEP                              ← VP
RestoreSEP                       ← VP
KernelCache                      ← VPR  (research, patched)
RestoreKernelCache               ← VP   (release, unpatched)
RecoveryMode                     ← VP
RestoreRamDisk                   ← PROD
RestoreTrustCache                ← PROD
Ap,SystemVolumeCanonicalMetadata ← I_ERASE
OS                               ← I_ERASE
StaticTrustCache                 ← I_ERASE
SystemVolume                     ← I_ERASE

8. Restore.plist

DeviceMap:     [d47ap (iPhone), vphone600ap, vresearch101ap]
ProductTypes:  [iPhone17,3, ComputeModule14,1, ComputeModule14,2, Mac14,14, iPhone99,11]

TL;DR

Boot chain = vresearch101 (matches DFU hardware); runtime = vphone600 (keybag-less boot); OS = iPhone.

The firmware is a PCC shell wrapping an iPhone core. The vresearch101 boot chain handles DFU/TSS signing. The vphone600 device tree + SEP + kernel provide the runtime environment. The iPhone userland is patched post-install for activation bypass, jailbreak tools, and persistent SSH/VNC.

9. DeviceTree identity rewrite

The vphone600ap DT carries 13 properties whose values contain the literals vphone600 / VPHONE600 / iPhone99,11 / vmapple / vresearch. Most are load-bearing (kernel kext-matching, restore-time identity, IORegistry path structure) and cannot be rewritten without breaking boot or restore. DeviceTreePatcher rewrites the 8 that are either userland-facing identity fields or SoC-generation descriptors with non-binding semantics.

# Path Property Original Patched Slot Risk
2 device-tree target-sub-type "VPHONE600AP" "D47AP" 12 HIGHER
3 device-tree compatible[1] secondary "iPhone99,11" (multi-string) "iPhone17,3" (multi-string, primary "VPHONE600AP" preserved) 48 LOW
10 device-tree/product fdr-product-type "iPhone99,11" "iPhone17,3" 12 HIGHER
11 device-tree/product sub-product-type "iPhone99,11" "iPhone17,3" 12 LOW
12 device-tree/product unique-model "VPHONE600AP" "D47AP" 12 LOW
6 device-tree/arm-io device_type "vresearch1-io" "t8140-io" (matches d47ap) 14 MEDIUM
7 device-tree/arm-io soc-generation "VResearch1" "H17" (matches d47ap) 11 MEDIUM-LOW
13 device-tree/product/vphone600-gestalt-variants name (node name) "vphone600-gestalt-variants" "d47-gestalt-variants" 27 LOW-MEDIUM

Properties intentionally left at vphone600 values (with the empirical reason for each):

  • device-tree.target-type ("VPHONE600") — Tier 2 attempt broke restore; iBoot / restored_external read this and reject the device when the value doesn't match the BuildManifest's signed identity.
  • device-tree.model ("iPhone99,11") — Tier 1 attempt broke restore; same reason as target-type.
  • device-tree.compatible[0] ("VPHONE600AP") — IOKit's platform-expert matching at boot binds against the FIRST entry of compatible. Rewriting it to D47AP forces _PE_init_platform_expert to look for a D47AP-claiming kext, which doesn't exist in our kernelcache. Panic guaranteed.
  • device-tree/arm-io.compatible / device_type / soc-generation (vmapple1 / vresearch1-io / VResearch1) — bind the vmapple1 IO controller kext, GIC, and PCIe drivers. Rename → no kext claims the SoC IO → boot panic.
  • device-tree/arm-io/gic.compatible, device-tree/arm-io/pcie.compatible — same family as arm-io entries.
  • device-tree/product/vphone600-gestalt-variants (node name) — referenced by libMobileGestalt-equivalent code that looks up the subtree by literal node name. Rename breaks the lookup.

Compatible multi-string surgical rewrite (#3). The original blob is:

[0..10]  "VPHONE600AP"       (11 bytes)
[11]     NUL
[12..22] "iPhone99,11"       (11 bytes)
[23]     NUL
[24..46] "AppleVirtualPlatformARM" (23 bytes)
[47]     NUL

Patched (slot length preserved at 48):

[0..10]  "VPHONE600AP"        ← unchanged: platform-expert bind site
[11]     NUL
[12..21] "iPhone17,3"
[22]     NUL
[23..45] "AppleVirtualPlatformARM"
[46]     NUL
[47]     NUL (pad)

AppleVirtualPlatformARM shifts 1 byte earlier but every consumer walks the blob by NUL-terminators, none depend on a fixed byte offset within the property. IOKit's platform-expert match against VPHONE600AP (first entry) is unaffected; the second entry, which userland walks of the compatible[] list see when enumerating identifiers, now reports iPhone17,3.

Risk classification.

  • LOW (#3, #11, #12) — read only by userland identity APIs (libMobileGestalt, IORegistry queries, App Store device class). No iBoot / restored_external / TSS dependency.
  • HIGHER (#2, #10) — target-sub-type is in the same restore-signed family as target-type (already proven to break restore); fdr-product-type is read by Factory-Data-Restore code paths that may check it against the BuildManifest. If restore fails after a build that enables these, remove them first and try the remaining LOW-risk three in isolation.

Wiring: all 5 patches are declared in sources/FirmwarePatcher/DeviceTree/DeviceTreePatcher.swift under propertyPatches. The serializer rebuilds the entire tree on every run, so each new value is written at the same slot length as the original. The compatible patch uses a new PropertyValue.bytes(Data) case that takes a pre-built byte blob (necessary because the multi-string layout contains embedded NULs).

10. Post-restore DT identity rewrite (EXP-JB-6)

The properties under "known-bad from prior rounds" (root model, root target-type) cannot be edited at fw_patch time because restored_external / iBoot's restore mode cross-checks them against the BuildManifest's signed SupportedProductTypes. But that cross-check fires only during installation. After restore completes, the boot path is

AVPBooter (patched)
   → iBSS / iBEC (image4_validate_property_callback bypass patches)
   → LLB (image4 bypass + rootfs bypass patches)
   → iBoot (research) → DT loaded from disk
   → kernel → sysctls populated from DT

The image4 bypass patches we already ship are what allow every fw_patch-time IM4P modification to boot at all — they make the IM4M's stored digest irrelevant on subsequent boots. So an additional IM4P modification applied after restore completes is in-policy with the project's existing trust-chain bypass.

The EXP-JB-6 install step exploits this (in cfw_install_exp.sh only — JB and DEV variants do NOT run it). While the install pipeline still has /mnt5 (the preboot volume) mounted in ramdisk mode, it:

  1. Pulls /mnt5/<boot-hash>/usr/standalone/firmware/devicetree.img4 to the host.
  2. Runs scripts/patchers/cfw_patch_post_restore_dt.py, which:
    • Unwraps img4 → IM4P → decompresses LZFSE → DT blob (via pyimg4).
    • Applies the three restore-unsafe edits (table below).
    • Re-compresses LZFSE → repacks IM4P → repacks IMG4 with the original IM4M.
  3. Pushes the modified img4 back to the same path.
  4. The device reboots out of ramdisk; iBoot loads the modified DT; kernel populates machine_info from the new property values.
Property Before (post-Tier-1b state on disk) After (EXP-JB-6 rewrites to) Slot
device-tree.model "iPhone99,11" "iPhone17,3" 12
device-tree.target-type "VPHONE600" "D47" 10
device-tree.compatible ["VPHONE600AP", "iPhone17,3", "AppleVirtualPlatformARM"] (post-Tier-1b) ["D47AP", "VPHONE600AP", "AppleVirtualPlatformARM"] (reordered) 48

The compatible rewrite is a reorder, not a replacement: VPHONE600AP stays in the list (now as the second entry), so IOKit's platform-expert match against the AppleVMApple1IO kext still binds. compatible[0] becomes D47AP, which is what userland's hw.model resolves to.

Userland-visible effects after the next boot:

  • sysctl hw.machine → "iPhone17,3" (was "iPhone99,11")
  • sysctl hw.product → "iPhone17,3" (was "iPhone99,11")
  • sysctl hw.model → "D47AP" (was "VPHONE600AP")
  • Settings → General → About → Model Identifier reflects the new ProductType.
  • Every MGCopyAnswer key backed by IOPlatformExpertDevice properties picks up the new values.

Idempotence: the patcher reads the existing DT, applies edits, and writes back only if there's a difference. A second run on an already-patched devicetree.img4 detects target-state-already-met and exits without rewriting.

Wiring:

  • scripts/patchers/cfw_patch_post_restore_dt.py — host-side patcher. Uses pyimg4 for img4↔IM4P+LZFSE round-trip; mirrors the DT format parser/serializer from DeviceTreePatcher.swift.
  • scripts/cfw_install_exp.sh [EXP-JB-6] — install step that runs after JB-5 (LaunchDaemon deploy) and before the CLEANUP/umount block, in the EXP install script only. Discovers the boot-manifest-hash via the same get_boot_manifest_hash helper used by earlier install steps. Tolerates a missing devicetree.img4 with warn-and-skip rather than aborting the install. JB and DEV install scripts do NOT carry this step.

Why this is restore-safe (and the fw_patch-time version was not):

  • fw_patch-time path modifies the IM4P bytes that are sent during restore. iBoot's restore mode reads each IM4P and (via the image4 validation callback the iBSS/iBEC/LLB patches already neuter) accepts its digest mismatch — but some other path inside restored_external enforces the top-level SupportedProductTypes check independently and rejects DT.model values that don't appear in that list.
  • EXP-JB-6 post-restore path never re-runs the BuildManifest check. Subsequent boots validate IM4P contents against the IM4M only — which the image4 bypass patches already wave through. So the same byte change that's fatal at restore is harmless after restore.

11. Build-version rewrite (EXP-JB-7, opt-in)

Opt-in step. EXP-JB-7 runs only when the SPOOF_BUILD environment variable is set — e.g. make setup_machine EXP=1 SPOOF_BUILD=23F77, or make cfw_install_exp SPOOF_BUILD=23F77 if you're re-running just the CFW phase. When omitted/empty the step is skipped entirely and the build identifier stays at whatever the IPSW shipped. Only the EXP install script runs this step; JB and DEV variants are not affected.

The iPhone IPSW we install from ships with build identifier 23B85 (iOS 26.1). iOS displays this string in Settings → General → About → "Build" and exposes it through MGCopyAnswer("BuildVersion"), CoreFoundation's _CFCopyServerVersionDictionary, App Store telemetry, and every other framework path that reads /System/Library/CoreServices/SystemVersion.plist.

The build identifier lives in exactly two on-device plist files. Both are plain XML/binary plists (no Apple-side per-file signature), and both live on volumes that are writable at install time:

Path Volume Role
/System/Library/CoreServices/SystemVersion.plist rootfs The canonical source. Read by every userland identity API.
/private/preboot/Cryptexes/OS/System/Library/CoreServices/SystemVersion.plist preboot Cryptex-side copy. Read by Cryptex-aware OS-version queries.

The EXP-JB-7 install step rewrites the ProductBuildVersion key in both plists to a target value (currently 23F77):

ProductBuildVersion: "23B85" → "23F77"

ProductVersion (26.1), ProductName (iPhone OS), BuildID, SystemImageID, and ProductCopyright are left untouched.

Wiring:

  • scripts/patchers/cfw_patch_build_version.py — host-side plistlib-based rewriter. Auto-detects XML vs binary plist format and preserves it on write. Idempotent — a re-run on an already-patched plist exits without rewriting.
  • scripts/cfw_install_exp.sh [EXP-JB-7] — install step that runs after EXP-JB-6 (post-restore DT) and before CLEANUP, in the EXP install script only. For each of the two plist paths it scp_from's the file to host, runs the patcher with target 23F77, scp_to's the file back. Tolerates missing-on-device with warn+continue. JB and DEV install scripts do NOT carry this step.

What this does not flip:

  • sysctl kern.osversion — populated at boot from a kernel global initialized from boot args, not from SystemVersion.plist. The kernel image we ship was built against 23B78 (the PCC vphone600 / vresearch101 build identifier; visible in 621 kext-Info.plist embedded DTPlatformBuild / DTSDKBuild blobs inside the kernelcache but never read by kern.osversion at runtime). To flip kern.osversion we'd need to either rebuild the kernelcache with a different OS_BUILD_VERSION or patch the kernel boot args path — out of scope for this round.
  • SystemVersionCompat.plist — carries 23B34a / 19.1, a legacy iOS-19 marker for MacCatalyst-style version queries. Not user- visible, deliberately untouched.
  • DSC dylib internals — the apparent 23B85 byte sequence in DSC chunk .21 is a Swift mangled-name UUID-uniquing substring (_TtC11MediaCoreUIP33_98519F523B8515A67EEFBCB0824D82807Counter), not a build identifier. Patching it would corrupt a Swift symbol name.

Order of operations: this step runs after EXP-JB-6 (the DT identity rewrite) so that any post-restore identity work targeting /mnt5 has completed before we modify the Cryptex's SystemVersion.plist (which lives on the same volume).

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