i know, I am a bit late for the party, but I recently read about this lovely device and I was lucky to get one almost unused (totally scratch free!) from ebay.
First of all, this is my first Android device, but I have a long history in obscure handheld devices (GP32/GP2X/PSP/Vita/NDS...), so I am not completely inexperienced.
I tried to flash it with this custom firmware, but I probably have a driver problem or something similar. I installed the drivers and they recognize the device, I can start the RKbatch tool, but as soon as I press "switch" the device goes dark and the RKbatch tool icon turns purple. However, the device manager recognizes it as the Rockchip device as it is supposed to, according to many reports here.
I tested it on a virtual machine only (Mac using parallels), however, I try to find a hardware PC still running Win 7, but what if I can't find one or what if it doesn't work as well?
Is there any other way to flash?
Just out of curiosity I copied the "update.img" to the root of a SD and mounted it. Android asks if I want to update. Is this a good idea?