Yes there is, I just did it and it works a treat! Its on the ftp site under shipped roms. Read the jasjar update guide elsewhere in this forum.
You'll need to install winrar in order to unpack the .exe from O2.
There are a few little oddities + if yr on t-mobile you wont want all the O2 junk. I'll post later what I did, I have stuff from O2, T-Mob and JasJar extended roms (but not much of each). An awful lot of sh1te comes with the device, and some simple messing is required to excise it.
I can tell you that in my experience:
- JasJar rom is slower than t-mobile (even before you install contents of ext rom.
- O2 Rom (with no extended rom) is quicker than MDA Pro rom
- O2 Rom + selection of cherrypicked cabs from mda/exec/jasjar runs better than t-mobile+tmobile ext rom.
Also, installing the XDA rom seems to fix the issue where the ruddy phone does not ring until 3rd ring when it is turned off. (I shall experiment with this more later) <--EDIT Nope, still does not ring until 3rd ruddy ring!
Anyway, i'll post a step-by-step, collating all the info from the helpfull chaps on here.
IMHO though, O2 run is currently the way to go.