Originally posted by lynx_1:

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I have upgraded my psp to 3.90 M33 but when I put iso's on it sometimes comes up with error code (80020148)How do I downgrade back to 3.52 M33 so I can reinstall 3.90 again? Or do I not need to downgrade is there something different I can do to sort the problem?

Originally posted by acidy:

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To access recovery mode follow the following steps :-
1. Completely shut down your PSP (Not stand-by)
2. Hold the "R" button (i.e right trigger) while starting your PSP ^_^
3. You are now on recovery mode
It should look something like THIS

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Originally posted by markyanon:

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i am a newbie bout psp i hv a psp fat set 3.52 m33 & a slim set 3.71 m33. i want to upgrade to 3.90 m33 what & how to do it?

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Originally posted by markyanon:

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i am a newbie bout psp i hv a psp fat set 3.52 m33 & a slim set 3.71 m33. i want to upgrade to 3.90 m33 what & how to do it?

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Originally posted by acidy:

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If you want to go to 3.90m33, then :-
Note : You can directly update your PSP from 3.52m33-4 to 3.90m33 too :)
-Download the 3.90m33 firmware from HERE
-Next, download the official 3.90 firmware from HERE
-Rename the 3.90 update to "390.PBP" and copy the file to the "UPDATE" folder of the 3.90m33 file you downloaded :)
-Then copy the "UPDATE" folder to the "X:/PSP/GAME" folder of your PSP ^_^
-Make sure you've configured your PSP GAME folder to run on "3.52 kernel" (If 3.52m33 firmware) or "3.71 kernel" (If 3.71m33 firmware) or "3.80 kernel" (If 3.80m33 firmware) in the recovery mode ^_^
To access recovery mode follow the following steps :-
1. Completely shut down your PSP (Not stand-by)
2. Hold the "R" button (i.e right trigger) while starting your PSP ^_^
3. You are now on recovery mode
It should look something like THIS
Then go to "Configuration" and in "Game folder homebrew" option, switch to "3.52 kernel" (If 3.52m33 firmware) or "3.71 kernel" (If 3.71m33 firmware) or "3.80 kernel" (If 3.80m33 firmware) ^_^
-Make sure your battery is completely charged (You need 78% battery for the update)
-Then run the Update ^_^
-The update will be done by Sony updater :)
-At the end, you will be asked to reboot the PSP by pressing X or O. DO IT (Or else your PSP will brick)
-You are now at 3.90m33, Enjoy :)

If you want, you can put the 1.50 kernel for 3.90m33 if you play 1.50 homebrew apps and games but this is only for the PSP Classic and not the PSP slim >_>
HERE is the 1.50 kernel addon for 3.90m33 :)

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Originally posted by mattypsp:

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help me please i have a psp phat and i need to downgrade the bloody thing too a lower version so i can then upgrade it 2 version 3.90mm3 i onli have the original 3.90

can anyone help me please

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