PSP 3000 - 5.51 to 5.03 downgrade

**satoru2984** · September 8th, 2009, 02:12

tlsolrac found a way to downgrade 5.51 to 5.03. He says he used hex editor. He says he tricked his psp by replacing 5.03 to 5.03.

He says "When you get a error, checksum of OFW". I don't get what he means by "CHecksum". What do you have to do?

**satoru2984** · September 8th, 2009, 02:13

Here's a link

http://www.dcemu.co.uk/vbulletin/sho...d.php?t=232182

**Nocuddle** · September 8th, 2009, 13:44

u r an i d i o t

**Van Helllsing** · November 11th, 2009, 00:12

You do realize that by doing such methods of hacking WITHOUT the pandora battery, you are risking your PSP's life? That's why i recomend using the battery and the memory stick.

**Rusty Tolentino** · February 2nd, 2010, 11:52

Hi Everyone!
Today is my first day here @ DCEMU uk..I am not so familiar with psp so I'm glad that i found this site..
Good luck everyone!
Rusty

**PSPdemon** · February 8th, 2010, 14:03

The checksum part means that when you change the variable ( say 5.03 to anything.... ) that hashed value changes the checksum key. So when its checked during launch it wont match up thus it'll throw a error.

Regardless if it was that easy don't you think others would have done that by now?