Returning to stock to give the phone to my SO. I have unlocked the bootloader, removed the non-stock key, reset/wiped twice in the GOS recovery, booted into fastboot, and stepped through the return-to-stock site.
Every time I try to install stock via the web the transfer errors out at about 450M (of 2.3G) and I get:
Ran out of space downloading file to your computer. Reloading the page may help. Make sure you have at least 10GB free disk space to download and extract images.
I've tried booting twrp with 'fastboot boot twrp-...' to clean everything, but with that I just get the Google logo and then it boots back to GrapheneOS.
I tried 'adb sideload bluejay-ota-ap1a.240305.019.a1-fd58dc50.zip' but that fails with
recovery: failed to verify whole-file signature
recovery: Signature verification failed
recovery: error 21
I'm stuck and confused.