Here is the Telus Radio Rom, EVDO REV-A
I have packaged it in a signed NBH for the diamond for you guys to try.
you MUST have a sprint PRL to flash via EPST (##778#) afterwords
Also its a good idea to write down your MIP settings before flashing so you can re-input these via EPST as well.
NOTE: I TAKE NO RESPONSIBILITY FOR DAMAGING YOU DEVICE! FLASH AT YOUR OWN RISK!
here it is
Edit: link removed as it was a long shot and did not work.
extract and run rom updater utility.
IF ANY ONE TRYS THIS PLEASE REPORT RADIO ROM VERSION AFTERWORDS! thanks