Quote:
Originally Posted by natalieclem
factory firmware (which by oversight allowed the unsigned signature to be used)
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Not quite. Those are official packages, they're left untouched, and as such are signed properly, hence why they pass the sigcheck.
The only thing that's relaxed is the device check, but, again, that's just because of the nature of the package: factory updates are Platform-bound, not Device-bound like OTA updates.