some apps dont work umdemu0.8c etc but not needed now
if your a well educated psp user i'd say upgrade it allows instant access to all 3.02 psp functions (except location free and korean fonts) with access to fully hacked official sony psx emulator to allow non-licenced sony released psx games and homemade psx games as well as umd compatability up to 3.02 and a recovery mode for advanced modders etc.
the only downside is a two second lag at start-up for loading the custom firmware, which is twenty seconds shorter than loading devhook
and you can also run devhook on 3.02oe-b if you wish.

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