Ok... FINALLY got MMS working on 21891 Sense 2.1! =D> It was VERY fast and integrated into the Manila messaging. It did not appear that going online to Sprint Picture Mail was necessary.
From a new flash, I installed the Remove Picture Mail Arcsoft cab, soft reset, then installed the Sprint Arcsoft cab, soft reset and BAM!
According to the Arcsoft app, version number is 5.0.82.79.
Flashing 2.5 now to see if it works.
edit: no luck on 2.5.
