Please prepare the following for the update:
1. A computer
2. A flash drive formatted in FAT32.
Please download the file to your computer. Move the file to the root of your flash drive. Do not put it in any folder in the flash drive. Keep the file name exact as "RL78.bin" with no extra letters or spaces.
Connect flash drive to one of the radio's USB ports. Do not connect that to the truck's USB ports.
Go to settings -> system info -> upgrade -> select "MCU upgrade". Wait for the progress bar to complete and the radio should reboot. After reboot the bluetooth should start to work.