How to Install 3.90 M33 Custom Firmware on a PSP

Step-by-Step Guide

1. 1

   Step 1: If you are going to format

   Go to system settings and choose “Format memory stick” and connect it to your PC.
   
   Formatting is not compulsory but recommended.
   
   Make sure your battery is 100% full before formatting. , Just Google the link. , If you don’t have WinRAR download it from www.winrar.com , The root is the window where you see "PHOTO"
   
   "MUSIC"
   
   "PSP"
   
   et cetera, and it is the topmost of the drive.
   
   If it asks you whether it can overwrite click “YES”.
   
   Important step:
   After copying the files, go to recovery mode (if you don't know how, see the video here).
   
   Choose Configuration > Game folder homebrew and set to
   3.xx kernel (e.g.
   3.52 kernel,
   3.71 kernel...) even if you have a slim PSP. ,
   3.90" aka
   3.90 M33 icon.
   
   The battery should be full when you do this, and also, if possible, plugged in. ,, I recommend Fat/Phat PSP users to install the
   1.5 kernel on their PSP tutorial here to unleash your homebrew power.
2. 2

   Step 2: back up your important files from your PSP.

3. 3

   Step 3: Format your PSP.

4. 4

   Step 4: Download the 3.90 M33 easy installation pack.

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   Step 5: Open it with WinRAR (not WinZIP).

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   Step 6: Copy the PSP folder to the root of your memory stick.

7. 7

   Step 7: Restart your PSP

8. 8

   Step 8: Scroll to Game > Memory Stick and click on the black "PSP Update ver.

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   Step 9: It will unpack

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    Step 10: then it will ask you to click on Start

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    Step 11: accept the user agreement

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    Step 12: and it will then install in about two minutes.

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    Step 13: You can now delete the update folder

14. 14

    Step 14: or better yet format your PSP again.

Detailed Guide

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