Well, I flashed a wrong icon set and messed my PSP up, anyway while in coldboot hold R then you will get to the recovery menu hopefully, use therecovery pack from here: http://www.dcemu.co.uk/vbulletin/showthread.php?t=49967 , then put it in the recovery folder on the PSP/Game directory on the memory stick, get a 1.50 update and rename it UPDATE.PBP then put it in the recovery folder on your PSP, then click Run Program At PSP/Game/Recovery/Eboot.PBP, you should be ok then.
Edit (1 hour later) : Did it work.
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