FAQs > Settings & Firmware> Q6: How to update the MCU?
1, Prepare a new U disk ( or an SD card plug into a SD card reader), format (FAT32) it first.
2, Copy the MCU software to the root of U disk
3, Insert the U - disk to USB from android screen
4, Go to settings / system information, you will see an " MCU upgrade", and click it
PS: The MCU update is quick (just few seconds) , if your model already with the latest MCU version, then it can not go ahead, thus, no need to update it.