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3.90 Downgrade help

Discussion in 'Sony PSP - Mod and firmware discussion' started by lynx_1, Feb 15, 2008.

  1. lynx_1

    lynx_1 Member

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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?
     
  2. lynx_1

    lynx_1 Member

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  3. acidy

    acidy Regular member

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    No need to go back to 3.52m33 >_>
    I think the error must be coming up when a UMD is not inserted in the PSP :)

    If you want to play .iso games w/o the need of a UMD then,
    Enter the recovery mode of your PSP :)
    Then, go to "Configuration" and then in "UMD mode" switch to "Sony np9660" :)
    And then go back and the go to "Advanced -> Advanced Configuration" and "Disable" everything there :)
     
  4. lynx_1

    lynx_1 Member

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    Thats worked. Many thanks.
     
  5. markyanon

    markyanon Guest

    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?
     
  6. markyanon

    markyanon Guest

     
  7. acidy

    acidy Regular member

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    Update your PSP classic from 3.52m33 firmware to 3.52m33-4*
    *HERE is the 3.52m33-4 update*
    You're PSP slim can be directly updated to 3.90m33 :)
    And then follow this guide :- (This guide applies for both the PSPs but do not install the 1.50 kernel addon for the PSP slim) ^_^
    Source : HERE
     
  8. someguy15

    someguy15 Member

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    I tried that,im on 3.90M33-2 but when i try to put on the 1.5 kernel it says ''cannot decrypt updater prx'' can u help?
     
  9. binkie7

    binkie7 Moderator Staff Member

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  10. jackoneil

    jackoneil Guest

    PLEASE !!! I was using 3.71-M33 and everything was fine... BUT.. "i cant resist" so.. installed 3.90-M33 (and updates Like Kernet, Fat...).. BUT now i wanna ask something WHERE i need to put my MUSIC, PICTURES and VIDEOS folders ??? Nothing is working anymore... just that message about "Not found"... And NOW ?? How can i still accessing those files ??? Can i DOWNGRADE to 3.71-M33 using Recovery ??? Please ! MSN: mcrnup@netsite.com.br
     
  11. terryyew

    terryyew Member

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    In need of help!!!!!!!!!
    i am using 390 m33-2, on phat psp but when i use a wallpaper the system jumped back to UMD mode in the recovery not the m33 so i went to the recovery mode to change (which is the correct way) to m33 no umd but now it seems when i entered the configuration the screen is blank now i can't play my games but i can still use my mp3 and movie player can SOMEONE PLS HELP!!!!!! what am i supposed to do??????
     
  12. mattypsp

    mattypsp Guest

    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
     
  13. 07anto07

    07anto07 Regular member

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    pandora battery and mms is the only way
     

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