While on this topic -- I saw this bit of good info posted by hailrazer over on KLOV --
Just an FYI for those of us trying to burn Mitsubishi M5L2764's on the GQ-4X
They are incredibly difficult to burn. A lot of times they won't even pass a blank check. I have over 40 of them from Nintendo VS boards and they were giving me tons of trouble. Only 1 in 10 would pass a blank check after "erasing" them. And those that did pass would hardly ever burn.
So in order to get them to work you need to open the devices.txt file in the GQ USB Programmer folder on your PC. Remove the following line:
Name="M5L2764",ID="XXXX",Class="2764(21V Vpp)",Category="EPROM",MFG="Mitsubishi",Message="A pply external power !";//by EZo
And add this line in it's place:
Name="M5L2764",ID="XXXX",Class="2764(21V Vpp)",Category="EPROM",MFG="Mitsubishi",VCC="5V",W VPP="21V",WVCC="6.2V",BVCC="5V",RVPP="5V",Message= "Apply external power !";//by EZo
Then they will burn and blank check every time