[gp-se]

Well I went from OMJ's Bell ROM with sprint 3.35.17 GPS radio back to stock today, this is how I did it.
Phone had:
ROM: OMJ's Bell OEM v2 ROM
Radio: Sprint 3.35.17 GPS Radio
2.31 unlocker

I first loaded the .40 unlocker,then once that was all done, I booted into the bootloader and on my PC ran the official bell software update (signed RUU)
after that everything was working fine, radio show's up as 1.59.10a
I found that the only way to get the Bell RUU to run was with the phone loaded in bootloader mode.
HTH for anyone trying to do this, the key is to overwrite the 2.31 unlocker with the 0.40 unlocker I think.