Originally Posted by tzkuei

I have tried something similar last night, but with 2.00 update, here is are the steps...

1. Download "1132801766_7_FT0_ieua_exploit.zip" found on psphacks.net
http://www.psphacks.net/forums/viewtopic.php?t=10268

2. Copy the EBOOT.PBP to one memory stick.

3. Copy 2.00 update EBOOT.PBP to another memory stick.

4. Start the IEUA exploit.

5. Swap to the memory stick with 2.00 update.

6. When it loads it waits for you to [Start].

7. Version check kicks in, and you cannot "downgrade".

That's it.