I install LennySh_Alltel_Arcsoft_3.0.26.12c first. Then install LennySh ArcSoft 5.0.71.33R3 Alltel. Then I uninstall the 3.0.26 cab. Soft reset. Then open messaging. Open sms/mms -> Menu -> Pics/Video Options -> Servers -> Alltel MMSC -> change port number to 80.
That's it. Tested with my Pro and my wife's diamond.
http://forum.htcgeeks.com/showthread.php?t=2 is where you get the files. These have been posted on this forum several times and you can find them if you search.