I have a Chinese noname multimedia with win 6ce that will no longer boot after a factory reset. The machine is effectively bricked. It takes 15-30 minutes before the radio starts, and the navigation screen show a disrupted version of the boot screen. I’ve tried the reset button, taking off power but nothing works. Cannot access the device via USB connection with PC.
I believe the best option would be to find appropriate firmware. I realize that this may brick the device indefinitely. The supplier does not help – cannot find firmware via google.

OS FEC 6.0 core
API vers: FYT-API-Class3-1.19
MCU vers: 1 9.22_8880_HSD7_BD3702_TDA7540
Can anybody help me finding the right firmware for the device? Please also provide update instructions. Any other suggestions?