You can't. At least not yet. Try searching the forums before you ask a question that's been asked umpteen billion times and met with the same answer each time.
If you have firmware v2.50 on your PSP, you can't do anything for now. Just sit back and wait. Or you can return your PSP to the store and get another one. Hopefully, you will get firmware v2.00 or below.
ok problem sony psp firmware no contains dnas you must have dnas on the psp or you will not be able to use the psp online so have fun also there is a way to downgrade from 2.50 you need to rewrite the exploit found in version 2.00 and change the tif file into a png file and it will work once again
i just recently found ouy about the psp hacks and i have 1.52 firmware, and want to know if i can still download nes and any other old games and if not is there a way to go back to 1.00 without having to return my system tothe store?
You can downgrade back to 1.52 by takeing your PSP back to the Store (in so far as your able to), and replace it. That's the only 100% way to downgrade a v2.50. But, it looks like it doesn't really matter though GTA:LCS came out Yesterday (or was it Today??), in some locations, and it has been confirmed that. YOU'LL HAVE TO UPDATE TO v2.00 to play it. So the next big title to come out (whenever!!), will mostlikely make you update to v2.50! It has also been confirmed that Firmware Changers also WILL NOT WORK! With GTA:LCS. So welcome to v2.00 for now!
