i got my ppc 6800 from bell stuck on the sprint network after letting the customizations run. After hunting around for a day or two i found this. Hope it helps.

1. Download ImCoKeMaN's original unlocker here: ftp://up.ppcgeeks.com/Vogue/Users/Im...e_unlocker.exe
2. Run unlocker.exe and follow the on screen instructions to a T as it is very easy to mess up. This will overwrite the 2.40. SPL. During the unlocking process your device will display 1.07. SPL. This will change once update is complete.
3. Once you finished with the unlocker, your SPL should no longer display 2.40 spl but should now display 1.07 spl .
4. Your device will automatically soft-reset after the update is complete. Do not allow to boot back up into OS. Instead, hold down the camera and power buttons and insert the stylus into the soft-reset hole again putting you in bootloader mode.
5. Since it is recommended that you flash back to the OEM bell ROM at this time, that is the link that I am providing here. Download and flash the Bell ROM. This will overwrite the custom SPL written by the unlocker.
6. You're now done. Your phone has now been reverted back to it's original shipped state.

PLEASE NOTE: It has been said that GPS radios and Non-GPS radios are very different. Flashing from the original 1.59.10a