M1 Air 2020: Failed upgrade from Sequioia 15.3.2 to 15.4, Can't ignore lock validation @t8020dart.c:535

Question

Created Apr ’25

Replies 6

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Hi, trying to upgrade from macOS Sequoia 15.3.2 to 15.4 gives this error. Now I can not boot from internal drive of M1 Air 2020, because it restores 15.4, that does not boot. I can only boot from external USB SSD that has macOS 15.3.2. How I can install back 15.3.2 or alternatively newer macOS to internal drive? I only have one Mac, this M1 Air 2020. I have AppleAppleCare+ to 9/18/25.

Remaining of error is attached here:

Can't ignore lock validation @t8020dart.c:535

panic(cpu 2 caller 0x0): t8020dart 0xfffffdf053908000 (dart-dispext0): Can't ignore lock validation @t8020dart.c:535 Debugger message: panic Memory ID: 0x6 OS release type: Not set yet OS version: Not set yet Kernel version: Darwin Kernel Version 24.4.0: Wed Mar 19 21:12:54 PDT 2025; root:xnu-11417.101.15~1/RELEASE_ARM64_T8103 Fileset Kernelcache UUID: 2BBA525B95E0E6B962ECC44FC093AB57 Kernel UUID: 4E6CBD31-CD1E-3939-8A63-211A206AFA66 Boot session UUID: 3A34167D-2534-402F-9679-2CAD45F67CDA iBoot version: iBoot-11881.101.1 iBoot Stage 2 version: iBoot-11881.101.1 secure boot?: YES

Boost

Answer 1

darkpaw OP

Apr ’25

These are the Developer Forums, where developers of apps for Apple's platforms ask each other for hints and tips on coding.

This isn't where you can get a direct line to Apple's actual employed Developers to help with your devices.

Your question is more of a product support one, so I'd suggest you ask it over at the Apple Support Forums. Thanks.

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Answer 2

NoeRmzTorres OP

Apr ’25

I have the same problem. Have you found a solution? I had to return to Sonoma to be able to work.

1

Answer 3

alarreateguic OP

Apr ’25

I have the same problem too and idk what to do.

0

Answer 4

Lyrae OP

Apr ’25

same issues

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Answer 5

KinlyDog OP

Apr ’25

same issues :/

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Answer 6

revorevagrab OP

Apr ’25

same issues

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