Upgrade recovery mode mtcD 10.1inch double 2din android 5.1.1 lollipop for android head unit
Note: Doesn't support android 4.4.4 kitkat, just for lollipop version
Download latest update firmware by from your computer, then put the upgrade file(MCU and update) from SD card or USB driver without any folder. Put the Sd card into GPS maps card slot or USB cable. then go settings, choose the about device and update system.
Or get android 5.1.1 system recovery, long press the power button(about 10 seconds), when the button light change color,please loosen,
then short press again within 1-2 seconds to get the update interface. then choose the update from SD card or USB and clear all.
https://www.joyingauto.com/
https://www.joyingauto.eu/