This is the most common method for functional Android head units.
There are two common methods to update the firmware of an Allwinner T5 device: allwinner t5 firmware update full
Updating the firmware on an Allwinner T5-based device—most commonly found in (Head Units) and TV Boxes —is essential for resolving software "hanging" issues, improving stability, and enabling new features like ZLINK5. This is the most common method for functional