I have CFW "5.50 Prome-4," and am having trouble playing Final Fantasy 4 Complete. The game keeps freezing during the movie scenes.

So.... I figured since I had not upgraded firmware in a while, THAT might be the issue. However, I cannot find a CFW upgrade that lets me upgrade from my current CFW to the newer ones. I cannot install OFW since my current CFW is newer than the OFW, and the downgraders don't seem to work for my CFW, either.

SO.... I guess my questions are:

1. Is the CFW the issue with FF4C?
2. Should I update?
3. If so, how do I go about doing that?