Note: V126.96.36.199 and V188.8.131.52 are the latest firmware version for Mars 300 pro
(Long-press thumbwheel to enter the menu to check the current firmware version)
Tip: We don’t recommand to do the upgrade if the device is working normally.
Please do the operations as below:
1. Prepare a small USB disk(16/32G), then format it to FAT32.
2. Download all the upgrade file to the USB disk root directory (It will recognize automatically to upgrade)
3. Connect the USB disk to our device, it will do the upgrade automatically after turning the device on