Tried to get back to stock on Pixel 5a via update from ADB, but getting the following errors:
...
Verifying update package...
ERROR: recovery: failed to verify whole-file signature
Update package verification took 45.5 s (result 1)
ERROR: recovery: Signature verification failed
ERROR: recovery: error: 21
Install from ADB completed with status 2.
Installation aborted.
I unlocked the bootloader and removed the custom key as described here, but still can't flash the stock.
Please advise.