Hi, I have a 1000 with 5.50 gen-b psp, and I want to upgrade it to 6.60 me 1.5. I looked for it an understood it is very simple except to one little thing that I'm not sure about it and this is te version.txt. It was written there that 5.50 gen is ok for upgrading but "may need to edit version.txt". Can someone tell me what do I need to do in this file to make the upgarde safer? Thank u all for the help.