Unfortunately, the MM712 CANNOT update the FW in Wired mode. When open the MasterPlus+ software, it will automatically read the current FW version of the MM712 and pop out the below upgrade instruction.
Please do not close the firmware update window and follow the instructions shown on window to update the firmware again.
Toggle the bottom switch to 2.4 GHz mode
Unplug the USB cable
Plug the dongle into your PC and make sure the MM712 is connected in 2.4 GHz mode.
When the firmware update window pops out, click “OK” or press Enter key to start the update. Please make sure to follow the instructions through the whole updating process.
After both the MM712 and dongle firmware setup is complete, the MM712 is fully updated and ready for normal use.