Version 9.90 | Psp

To understand version 9.90, you have to understand the war between Sony and the PSP homebrew scene.

Find where it says release:9.90: and change it to release:5.50: . Save the file and exit. psp version 9.90

: On your PSP, go back to the VSH Menu (Select) and change USB DEVICE back to Memory Stick . This is a critical step to prevent system corruption. To understand version 9

You are stuck. The PSP will refuse to install any official updater because it thinks you’re running a more advanced system. To understand version 9.90