LBP, you are correct 2.62_003 is the latest I saw. (I think I goofed when I PM'd you).
I flashed to the latest radio (2.42.02.10.29) months ago and it didn't update my PRI or my PRL. I flashed the NFX Stock Rom and updated my PRL, but I couldn't figure out how to update PRI. Got a lead from CrashV2010 over on XDA that he had unrooted to get latest PRI. So I decided to give it a try. I used the RUU method here
[RUU] Official 2.31.651.7 in ZIP Format, Flashable from Fastboot - xda-developers
That RUU has the .27 radio.
- RUU
- Used RegawMOD Hero Rooter (slick)
- Flashed .29 radio (again)
- Booted into ROM and updated PRL again. It appears that 60676 is highest PRL available on the .27 radio. So after I reflashed .29 radio I did another PRL update and got the 60677.
- Then I did a fresh install of AsopGB 3/26 w/Firerat
Note: there was an OTA that was offered while I was on the RUU rom. I almost accepted it, but chickened out. Not sure if they have closed another loop hole that would prevent me from gaining root and didn't want to chance it.
End of the day, I believe I have all the latest updates for this phone and my reception still sucks!

At least I know I tried everything I know. And I re-learned how to root. WOW is it easy now!!! I did it the good old-fashioned way. With these one click rooters I don't know why anyone would run a Hero without root!