When you turn it on by the menu button (8bitdo logo button) hold either a or b for xinput or dimput mode, on ximput it only has the same buttons as an Xbox controller, but on dinput you get the extra buttons the gyro and the accelerometer
Update the firmware on a windows VM and then turn it on while holding b to go I to dimput, if you want it to go back to x input turn it of and then on while holding a.
On dimput you can use the extra shoulders, the paddles, the gyro and the accelerometer
With my ultimate 2 wireless I just put it in dinput by turning it on by holding b and everything works, including gyro and accelerometer and can bind anything with antimicrox
Just over 8 tb since yesterday, just on getting my trove (RPG) of Linux isos