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afterdawn.com > forums > consoles > sony psp - mod and firmware discussion > how to downgrade my psp (slim)??
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How to downgrade my psp (slim)??
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javier91
Newbie
_ 		7. March 2008 @ 10:21 _ Link to this message    Send private message to this user   
Now my psp slim is verson 3.90 anyone know how to downgrade from 3.90 to 3.71?
[ + quote]
Feenix888
Member
_ 		7. March 2008 @ 10:43 _ Link to this message    Send private message to this user   
Create a Pandora and MMS. Slims require a Hard mod to teh battery unless you can get hold of a Phat battery to sdoft mod.

Universal unbricker will do what you want OR a installer such as UPMS
[ + quote]
PsP#1 : 2.01>3.71M33-4>3.80 M33-5
PsP#2 (Slim) : 3.80>3.90M33-2 All hail the UPMS Stck
If you need a UPMS Stick go here and then go here :-) *As recommended by January39
Deathtord
Member
_ 		7. March 2008 @ 11:42 _ Link to this message    Send private message to this user   
Use this guide: http://forums.afterdawn.com/thread_view.cfm/610313

Buy a slim datel tool battery. It worked with mine. Make sure you follow the guide real carefully because it will not work on Slim PSPs sometimes.
[ + quote]


PSP: 5.00 M33-6
===============
Nintendo DS: R4 v1.18
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