These sources provide the best technical and academic context for studying firmware like the RK3229 V3.1:
Click on the firmware button in the tool and select the downloaded .img file. Connect in Maskrom Mode: Plug one end of the USB A-to-A cable into your PC. Mxq Rk3229 Emcp V3.1 Firmware
Once you have your hardware details, you can search for compatible firmware. Below are a few safe starting points. These sources provide the best technical and academic