Blackberry Curve 8350i flashed to BOOST

I was able to successfully flash my BlackBerry Curve 8350i to boost back in August, put in the new service books and everything was working great. Something happened to my phone and i wasn't able to charge it so I was using an old backup Nextel phone for about 5 weeks. I was finally able to charge my BlackBerry and use it again, but now everything works except for the MMS....I'm so confused, why would it stop working just because it was turned off? And why does the internet work but not the text? Do I have to re-flash my phone? Will I lose all my data?
Can someone please help me?

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Hey man!
maybe you can help me. I got a BlackBerry 8530 from sprint, just found it and when i called the guy told me he didn;t need it anymore because was a corporate phone... anyways. I'm from Canada so I wanna to make it work for Telus. what do I have to do to flash the phone and get the service books etc. can you help me? I'd really appretiate it.
thanks

I just bought a Nextel Blackberry 8530i and would like to flash it to Boost. How do I do this? I seen Tank's instructions, however, I was unable to open the link for the download.