2.1 to 1.5 does it cause problems?

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I am just wondering would the fact i downgraded from a 2.1 rom sensehero 2.2 to a 1.5 rom sensehero 1.6 would this be the cause of me not being able to send mms messages?

I mean i have wiped my phone a few times cleared the data to factory settings i have entered the correct apn settings for my network *Meteor Ireland* I dunno what else to do i really am stuck on this.

And MMS zap does not work on 1.5 rom s so any ideas??

if you do a full wipe before flashing the 1.5 rom there is nothing left, thus it cannot be related to the rom you used before.

Thats what i assumed yes which is why this makes no sense to me at all.
I am gonna wipe again and try another 1.5 rom cause this is crazy i have been at least a month trying to fix this