I atempted to flash my brand new, unpawed Dingoo following omgomg's fine instructions. My Dingoo arrived with firmware v 1.10. I downloaded the official 1.20 updated firmware which I then edited in hxfeditor making only to changes: I set englich as the default and patched to use external themes. I successfully flashed the edited hxf file but the dingoo hangs at the startup screen. I then attempted to flash (using the china chip flasher) an unmodified v1.20 file. Upon reboot, I got the red "unauthorized" screen. ARRGH.
I forced reboot by pressing the reset button and while holding the B button down. I again flashed (using china chip flasher) the unmodified v1.2 firmware. This time it worked. So I tried one more time to flash the slightly modified firmware (as mentioned above) and I got the screen hang again. Once more, I flashed the unmodified frimware v1.20 and it is working. I really want a modified theme, what the hell am I doing wrong?