I think I have same problem with my MP4 player(RK27SDK Diel Canto 2gt 4,3"touchscreen) but RK27Device Manager doesn't seem to work. When I'm trying to restore my player it says "
Rock USB device not found." what can I do with this problem? I have tried RKusb.tag teclast.sys and FRK.tag files but I can't see
"
hidden" partition.
I have backup of my firmware.