copy the recovery folder in "flasher for recovery" to ms0:\psp\game and put your 1.5 eboot in their as eboot.pbp. Hard off your psp and then power it on while holding R. select "Run program at /PSP/GAME/RECOVERY/EBOOT.PBP" after it finishes you'll have a fresh 1.5 psp...now just update to the firmware of your choice.
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