How do I get to recovery mode on Android head unit?
try long press power button for about 5seconds, then short press the power button ,see if you can enter the recovery mode.
How do I factory reset my Android stereo?
How do I fix my Android it wont boot into recovery?
Step 1: Press the Volume Down button to go to the wipe data/factory reset option. Step 2: Press the Power button to choose the option and start the process. Step 3: Upon the completion of the process, your device will reboot normally, and set it up again to use your device just like you use it normally.