This is the latest update for this:
Code:
Model: NoteAir (English)
Finger: ONYX/NoteAir/NoteAir:10/2023-12-12_21-24_3.5_4687b1901/12699:user/dev-keys
Link: http://firmware-us.boox.com/6859d1b33b0669ee377ebdcc1c20c7c5/update.upx
Size: 1,707,033,746
MD5: 6859d1b33b0669ee377ebdcc1c20c7c5
You can try decrypting this update with DeBooxUpx (google it) and then in recovery:
Code:
adb sideload update.zip
All your button presses are basically "power switch five times after reset" to get to recovery.
If you do a normal reset it will try to hit the normal system (and presumably fail).