Hi I currently have a PSP 1000 with 5.50 prome-2 cfw on it. I haven't used my PSP in a while so I've forgotten quite a lot about upgrading/downgrading cfws. Currently it seems best to update the cfw to 6.60 PRO-C. So I'm hoping someone here can help with how to upgrade from 5.50 prome-2 to 6.60 PRO-C. Oh and I also heard that if you updated a PSP with cfw of 5.50 Prome-4 to 6.60 firmware, this will result in some kind of error? Will that also happen for 5.50 Prome-2, and how would I fix this error? Thanks in advance.