Allwinner T3 P1 Firmware Download ^hot^
Look at the silkscreen on the main chip. If it says T3 – use T3 firmware. If it says P1 – use P1 firmware. Using the wrong file will hard-brick your device.
Mainline Linux lacks full GPU and video decode drivers for the T3. Stick to the vendor BSP (Linux 3.10/4.9) for production use. Allwinner T3 P1 Firmware Download