: Depending on the processor you found in Step 1, you will need a specific flashing tool. For Allwinner chips, this is usually PhoenixCard or PhoenixSuit . For Rockchip, it is RKBatchTool .
Never download isolated parts from random forums unless they provide the entire list of files. Download R69 PD66 QT552HP Firmware part07 rar
Looking for specific firmware files for generic Android TV boxes (like the : Depending on the processor you found in