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sorry dude but the only way to downgrade a psp 5.5 is to use a Pandora battery, they cost about 8 dollars at dealextreme.com

or you can plug your PRO DUO stick into the computer and download the version you want. Before you download the the version you have to save it to folders PSP>GAME>UPDATE. Every folder must be in caps. then you put the memory stick into the psp and start the psp. make Sure your battery is fully charged and you must plug the psp into the wall before you take the next step. If you do not follow the instructions located in the the previous sentence or cancel the version from downloading while its downloading it could damage your files. now you go to the games menu and go to memory stick then you will see PSP update ver.... Then you click on it and it will start

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12y ago
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14y ago

Yes, you can. But you must be very careful while downgrading because it can brick your PSP.

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14y ago

Yes but you must "Hack" Your PSP which is not illegal but doing so incorrectly can permanently destroy your PSP.

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12y ago

ok do no wat you must weit two or four months their will be a permenat hak vercion

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14y ago

iam not sure maybe you could just use the same method as downgrading and OFW firmware and it'll work

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Q: How can I downgrade my psp ver 5.5 to any version with m33 on it and is there a ver 5.5 m33?
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How do you downgrade PSP version 4.01?

how to downgrade psp 4.01 version...i used Pandora and magic memmory but no responce from the psp?


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Which is the the safest to do hacked your psp version 6.60 or downgrade it to 6.20?

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