I'm in the process of updating using flash_open2x.gpu and open2xfile.img and it's been sitting on a black screen for a few minutes now.. I'm on the official 1.4.0 firmware.
I also find the readme quite sparse for something so 'big'. I'd like to see a better explenation of certain steps and...
I was using the DOA skin when flashing, I changed then back using Skin2X and 'Please waiting' was back :).
The firmware writes a file, the Skin2X writes over it (seeing as the DOA has a custom Please Waiting I think)
I got soooo lucky, I had just been woken up with 'Dieter, a package arrived for you' and immideatly put on the glass cover downstairs. I'm soooo glad I didn't get any dust trapped in there :D