I DID IT TOO!
Just took my brother from 2.80>1.50>3.02OEA!
Here is the short version of what to do:
***DO NOT DO THIS IF YOU HAVE TA-082, OR ANY FIRMWARE BESIDES 2.80. You must use the Xloader program that is installed alongside Eloader, NOT Eloader itself! DO NOT USE ELOADER, ONLY XLOADER!***
***No really, Please dont.***
1. Dont do this yet, its too dangerous. DO NOT DO THIS IF YOU HAVE TA-082
2. Backup ALL psp files.
3. Dont do this yet, its too dangerous. Seriously.
4. Format your MemoryStick, install
eloader0995.
5. Get the downgrader from
here.
6. Dont do this yet, it is REALLY dangerous.
7. Go to PHOTO -> Memory stick -> xLoader 280. It should show a picture and a corrupt icon (That means it worked). To test that it worked, try running the installotron... USE XLOADER, NOT ELOADER.
8. Go to Game, and run the downgrader by pressing x.
It will not give you ANY info as it works, do NOT turn off, put on sleep, remove battery etc, or you will brick. I suggest you have 100% battery and the cord plugged in as it runs.
9.Wait for it to say "Finished. PowerOff to exit", and hold power switch up until psp is completely off.
10. Pray.
11. Restart your psp, and you should have 1.50!
Then go to
here to upgrade to 3.02 OEA.