New C3x flashing results in "Download mismatch The system image downloaded does not match the expected checksum. Try again."

[Deanusenvy]

Hi I just got my 3x after having issues with the 3 and trying all different ports and cables I keep getting "Download mismatch
The system image downloaded does not match the expected checksum. Try again." nelsonjchen asked me to open an issue here in the discord convo. He said "There was a slightly hasty change made last night In retrospect, I didn't know it went in that fast"
Thanks, Dean

[adeebshihadeh]

Reverted, @incognitojam is flash not compatible with the new manifest?

[Deanusenvy]

Hi, thanks for the reply. I was able to complete flashing and setup. Haven't driven yet but the UI seems fine (like the C3).

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On Sat, Mar 1, 2025, 1:49 PM Adeeb Shihadeh ***@***.***> wrote: Reverted, @incognitojam <https://github.com/incognitojam> is flash not compatible with the new manifest? — Reply to this email directly, view it on GitHub <#115 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BQAMUWUUVTDA2QRVQW7FGM32SH6MZAVCNFSM6AAAAABYEJTPU6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOJSGM3DGOBUG4> . You are receiving this because you authored the thread.Message ID: ***@***.***> [image: adeebshihadeh]*adeebshihadeh* left a comment (commaai/flash#115) <#115 (comment)> Reverted, @incognitojam <https://github.com/incognitojam> is flash not compatible with the new manifest? — Reply to this email directly, view it on GitHub <#115 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BQAMUWUUVTDA2QRVQW7FGM32SH6MZAVCNFSM6AAAAABYEJTPU6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMOJSGM3DGOBUG4> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[maxime-desroches]

@incognitojam Since we are now including sparse images in the manifest, the hash_raw field is a bit different for those: commaai/agnos-builder#443 (comment)

[incognitojam]

I think the hash stuff was changed after I reviewed it 😕 And it wasn't checked automatically in Flash CI because the download/unpack is slow (> 10 mins on the actions runner), so I skipped the tests for the system image in CI and only checked it manually with the earlier manifest. #116 will help to highlight this in future with a slow but non-blocking CI job.

The cause of this issue is that alt.hash is like a hash_raw instead of a SHA-256 checksum of the image. #117 should fix this by ignoring the alt image.