Rk3128 Mxq Ep 68 Firmware Link Page
Ensure you are using the correct USB port on the TV box (usually the one closest to the SD card slot or labeled OTG). Try a different USB port on your PC (USB 2.0 ports are more stable for flashing than USB 3.0).
Ensure you are using the correct USB port on the TV box (usually the one closest to the SD card slot or labeled OTG). Try a different USB port on your PC (USB 2.0 ports are more stable for flashing than USB 3.0).