1. Identify the suitable firmware
a. .mac firmware compatible with WIN7, WIN8, WIN10 or XP.
2. Download the corresponding firmware to your model from the below links
3. Connect your radio to the computer with a USB cable and power the radio on, it will appear as an extra disc on your computer
4. Click YES as the window pops out when connected to format your radio
5. Once done formatting, your radio(the extra disc) should be empty
6. Copy the latest firmware and past it in your radio(the extra disc)
7. Once finish Step 6, disconnect your radio from the computer and repower it on
