This could be useful for others...
Seems that I have killed my MP4 USB port...
I was trying to find a rockchip firmware for a 2.2" 224x176 screen.
I load a wrong firmware: Ramos RM100 for rockchip 2606A, as it doesn't work, I plug in the USB port using the key combination to get a safe connection, upgrade connectio (rockusb)... the blank screen started to flash on every combination i do.
After that never again the device was recognized by the computer... in no way... including short circuiting of flash memory.
DEAD!!!
RAMOS firmware seems to be a lot different than others rockchip firmware!
:? happily was the lovely device I had for testing purposes
