For the NoteAir3 there is currently a full and an incremental update.
You will need to do the full update using custom recovery and a flash drive.
The incremental update should
not be done using recovery.
You can either "Check for updates" in the Onyx settings or download update.upx, adb push it still encrypted on /sdcard/ then kick it to update.
Code:
Model: NoteAir3 (English)
Finger: Onyx/NoteAir3/NoteAir3:11/2025-03-27_10-47_v4.0-rel_2aa96eb60/7548:user/release-keys
Link: http://firmware-us.boox.com/6f3fcc42fb6bde7e52e9633701b6ee47/update.upx
Size: 1,854,809,998
MD5: 6f3fcc42fb6bde7e52e9633701b6ee47
Model: NoteAir3 (English)
Finger: Onyx/NoteAir3/NoteAir3:11/2025-04-27_20-50_4.0.2_135ce530f/7596:user/release-keys
Link: http://firmware-us.boox.com/25785598fc220f2835034b280ecf52e8/update.upx
Size: 36,963,188
MD5: 25785598fc220f2835034b280ecf52e8