HELP : PSP 3004 Hack, 6.60 to 6.20


I am completely new to this forum, registered to in the morning and tired searching every topic. didn't find perfect answer.

I have downgraded my PSP 3004 6.60 ver to 6.20 version using Davee downgrader.

now what should I do to play games in it ?
can it play cso and iso both ??

I just put the cso file in iso folder but not working, please help

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