GTMedia v9 Prime Downgrade from Mars to Original

HI

help please

I taught I download the original firmware update for my GTMedia v9 prime when I rebooted the box and I discovered the it was mars firmware/

How do i revert back to original GTMedia firmware Where is the reset button or reset pins on the motherboard,

Do I need a RS232 to USB PC cable

GTMedia V9 prime Downloaded Mars firmware V9_Prime_V20260525.bin.

HI Boguss

Thanks for the reply and infrmation to return from Mars to the original firmware

Have a good day