I have a similar question as the above poster. I just got an older PSP fat 1000 from a friend of mine. The OFW on it is 3.40. If I follow this tut, will the CFW on my PSP be permanent, or will I have to watch my battery level to make sure it doesnt shut off? Would it be better for me to downgrade to 1.50 than use this method? I just want to know before I start so I don't get stuck at 5.03 OFW.