Update and problem resolution, I installed SlimboxTV using the Amlogic USB Burning Tool! After many attempts, using a 1m cable, I only managed it because I used an Essager USB Adapter, directly in Windows it didn’t recognize the TOX3 at all!
TOX3 slimBOXtv 34.1 TOX3 / TOX3 lite TV box - Обсуждение - 4PDA
Finally I managed to use all versions, including “aarch64”, the best one I tested was “CoreELEC-Amlogic-ne.aarch64-21.0-Omega_rc1” which plays VC1 smoothly and suspend mode with AVR!
the “CoreELEC-Amlogic-no.aarch64-21.0-Omega_nightly” version is nice, but VC1 and suspend mode with AVR doesn’t seem to be playing normally.
Apparently the problem must have arisen after some firmware update on Android, launched by the team itself that corrupted the super partition perhaps? But the android worked normally.
This is my first time using Amlogic USB Burning Tool, it was difficult to recognize tox3, but after that it was quick!
Now suspend mode works great with q990c AVR in “CoreELEC-Amlogic-ne.aarch64-21.0-Omega_rc1”
Before, when returning from sleep or suspension mode, the coreelec would freeze, and I had to forcefully restart it, so I wasn’t using sleep mode, I just left the box on. Now everything is working so perfectly wow. If I had known that it would solve so many problems, putting new firmware on the box, I would have done it long before.