These are the final Mighty ROMs for the HTC CDMA Diamond (Sprint, Alltel,
but NOT Verizon).
MR4 is based on WM 6.1, MR6 is based on WM6.5. My personal opinion is that
MR4 is the better of the two.

Also here are two patches, both for MR4. One is to fix the SMS 2016 bug
that started in 2010 (hex 10 is decimal 16). The other is the package
need to activate Sprint data and update the PRL.