You must reconstruct the header from the original:
If binwalk fails (due to obfuscation), manually locate the payload offset: repack payloadbin exclusive
This usually requires a Linux environment (like Ubuntu or WSL) and Python. You will use the brillo_update_payload You must reconstruct the header from the original:
Repackaging involves modifying original files, which can sometimes be used to hide malicious software. repack payloadbin exclusive
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