I've done all the steps to flash my P990 to this:
But I only put the Core ROM in the sdcard and now I just have the core and and can't get access to the card on the pc to put the Gr4 option pack 'extreme edition' .
what can I do ? is there a shortcut in the phone to enable the usb mass storage? I didn't see any option for this in the recovery mode.
Is the only option to put the card in a card reader and load a flash?