All credit goes to MPH for creating this hack to downgrade PSPs. To restart hold the power button for about 10 seconds once it is off wait 10 seconds and turn it back on.
Notes: Make sure there are no other Photos other than the overflow image present in the photos folder during this “downgrade” procedure.
Thats normal so just restart the PSP and it should show an error.Follow instructions and then at 99% an error should popup.Then finally Game Menu and launch the v1.5 updater (downgrade).You will need to wait ~30 seconds and then restart your PSP.In your PSP enter the Photos section, which will launch a little app.Make sure your AC adaptor is connected.Finally copy index.dat into root folder as well (X://index.dat).Copy overflow.tif into X://PSP/PHOTO/ folder.Unzip the PSPdowngrade.zip package and open the folder.Copy EBOOT.PBP (v1.50) into X://PSP/GAME/UPDATE folder.Create the X://PSP/GAME/UPDATE directory if it doesn’t exisit.To downgrade do the following: (read entire post first! notes bottom)
PSP ROOT FOLDER DOWNLOAD UPDATE
If you do downgrade from v2.0 you will always be able to bring back v2.0 by doing the standard update procedure once again.
PSP ROOT FOLDER DOWNLOAD UPGRADE
(this version will allow using homebrew applications) Also if you have v1.51 or v1.52, you will need to upgrade up to v2.0 and then you will be able to downgrade. After a long awaited time, the a PSP downgrader is finally available! This will allow all PSP owners who have upgraded their PSP to v2.0 to downgrade all the way back to v1.5.
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