[electronicrice]

Correct, the newer Manila versions require code from newer WM versions. For instance, Manila 2.5 requires components from WM 6.5 in order to work.

Manila 2.6, on the other hand, is to be used on a different processor, but is essentially the same exact thing, just different build number.

HTC does not provide straight upgrades for Manila. Instead, it must come preinstalled in a ROM provided by the carrier. Until we have an unlocker and can port those versions (OEMs) to custom ROMs, we're unfortunately at the mercy of our carriers.