your have two options:
1) make a pandora battery (look it up) and use it to revert to official firmware, and than just update
2) update to Dark_Alex's 3.90 m33-3 cfw (http://www.dark-alex.org) witch is the normal 3.90 firmware + the 1.5 kernel, and so you'll still have access to your homebrew and all UMDs
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