Please do not power off during the update process, and ensure that the battery power is no less than 30%.
Highly recommended: OTA update
Connect to Wifi and insert the micro SD card into R2 II click System settings -> Firmware update -> Via OTA. Then R2 II will get updated.
Steps for manually upgrade:
1. Download the firmware file and copy it to the root directory of micro SD card;
2. Insert the micro SD card into R2 II;
3. Click System settings -> Firmware update -> Update via micro SD card;
4. Wait for the R2 II updated automatically.