Default [Q] flashing stock after encryption

well, i done goofed.

i've enjoyed many roms, but for work was forced to encrypt the device. didn't occur to me it would make life hell.

i've read some some other people had the same problem, the only solution is to flash a stock image.

i've been trying that with the GNEX tool kit, but don't get very far - i've got the image downloaded, begin to flash it, and as soon as it gets to the radio part I get an error and it shuts down.

any other way i can try and flash back to stock, or any other way to get the encryption off?