Go to the 4PDA forum thread for "Allwinner H313/H616" and filter for your specific box name (e.g., "Tanix TX3 H313 slimBOXtv"). Download the .img file (usually compressed in .7z or .rar ).
Ensure the ROM matches your exact motherboard revision and Wi-Fi chip (e.g., Allwinner H313 with an RTL8723 or copper-top board variant). Flashing the wrong Wi-Fi driver will break your internet connectivity. Step-by-Step Installation Guide via PhoenixSuit Allwinner H313 Custom Rom
When connected, PhoenixSuit should detect your device (check Device Manager for "Unknown Device" if not) Go to the 4PDA forum thread for "Allwinner
: PhoenixSuit reports "Failed to copy firmware" during flashing Flashing the wrong Wi-Fi driver will break your
PhoenixSuit is the definitive desktop flashing software for Allwinner devices using .img files. Alternatively, PhoenixCard allows you to flash firmware via a bootable MicroSD card.
A progress bar will appear. The flashing process usually takes between 3 to 7 minutes.
Wipe cache/dalvik cache before rebooting