you can customize the xmb in 3.03oe but you cant do as much in 3.10oe so i would'nt upgrade if want to customize your psp. before you try to flash any custom stuff it would be wise to put the recovery folder in your game folder which i can send you if dont already have it as for flashing custom stuff you can access your flash0 in the recovery menu by selecting advanced and then selecting toggle usb(flash0) and connecting a usb cable a new window will open on your pc showing the contents of flash0 to change your topmenu etc just locate them on flash0 and then overwrite them with the custom ones (make a backup of flash0 just to be on the safe side)
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