Sources

Nothing from the stock firmware is in this repository, and no third-party code is copied into it.

Used for flashing and building

What	Source	How it is used
actions_dump, adfus loader, nandread payload	ilyakurdyukov/actions_flash, commit 0a7d9cf	git submodule actions_flash/; the X91 page-size scan is our patch patches/actions_flash-x91_scan.patch
Flashing sequence, read-only driver patch	TheWirelessPhoenix/a02-os	re-implemented in x91_dump/x91_flash.py; no code copied
Vendor flash helpers fwscf651.bin, nandhwsc.bin, flash_id.bin	AGPTEK A02XT/A02PLT firmware package A02T-20250709-V1.0 (download page)	not in git; extracted locally, checked against x91_dump/flash_helpers/SHA256SUMS.txt and the hash pinned in x91_flash.py
Ubuntu typeface	Ubuntu Font Family (Ubuntu Font Licence 1.0)	rendered from the installed system font by design/graphite/typeface.py

Used for analysis only

What	Source	How it is used
atjboottool	Rockbox utils/atj2137/atjboottool, commit ef1b9d1 (GPL-2.0-or-later)	decrypts vendor .fw packages for firmware_analysis/tools/analyze.py
US212A SDK of the ATJ2127	Suber/PD196_ATJ2127, commit b964feb	names, structures and logic for reading the X91’s code; nothing copied
AGPTEK packages of the A02 family	agptek.com firmware downloads	compared with the X91’s files (firmware_analysis/package_summary.tsv); never flashed