Hackers has manage to break 6.39 official psp firmware which means I am going to make another guide for 6.39 ofw.
Installation ofw 6.39
If you do not have official firmware 6.39 , then you need to install this first. Download ofw 6.39 UPDATE. PSP 2000/3000 and PSP GO series use different firmware so make sure you download the right one.