The problem was that my son mixed up usb fkash drives. He flash a wrong software to the headunit.
He used the wrong usb flas drive and flash a Mekede M7 software to the headunit. Now when I try to flash the DUDU7 firmware the unit have that error. Saying that the firmware is older than the one already loaded. "Downgrade not allowed" errror. Is there a way to fix it?
Thanks,
Morey R.