Downgrading your psp is not really recommended, since every time you update or upgrade your psp, there is a chance of bricking your psp. especially 3001 and Go models. I do not recommend doing it, but here is the "How to" anyways:
- Start 6.20 TN-B
- Download the following files:
- Place PSARDumper in the PSP/GAME folder like you would any other homebrew and copy the OFW EBOOT.PBP to the root of your memory stick
- Start PSARDumper and press circle
- After the program finishes, connect the USB cable to your PSP and navigate to the folder F0, which should now be at the root of your memory stick
- Copy /F0/vsh/etc/version.txt to /seplugins/version.txt
- Go back to your PSP XMB and press select to bring up the VSH menu. Go to “Fake Index.dat” and change it to “enabled”. Next, select “restart vsh”
- Copy the OFW EBOOT.PBP to “PSP/GAME/UPDATE/EBOOT.PBP”
- On your PSP start the OFW installation as you would any other firmware update
- After it finishes, the PSP will restart and a blue screen will appear saying that the PSP settings are invalid. Press circle and the PSP will restore default settings and restart. You now have OFW installed.
Source: psp-hacks
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