Most H616 boxes are abandoned on Android 10. The open-source community has backported and even Android 13 for the H616 via projects like LineageOS 20 .
For TV boxes, the best custom ROMs offer a real Android TV (ATV) interface, not the broken "mobile Android with a launcher" that stock firmware uses. Benefits include: allwinner h616 custom rom better
: Widely considered the best "all-around" custom firmware for Allwinner H616 boxes. It offers a cleaner UI, better root management, and improved thermal handling. Most H616 boxes are abandoned on Android 10
: If you want to turn your TV box into a lightweight Linux server or desktop, is the primary choice for the H616. Stock "Clean" ROMs better root management
Root access is the "administrator" mode for Android, giving you full control over the system.