HOWTO: 3.90m33-2 with 1.50 add-on

What you need:
Homebrew enabled PSP 3.52 M33-3 or higher

The installer: http://exophase.com/files/psp/390m33_2.rar

An internet connection (easy)(longer upgrade time)

A 3.90 Official FW file (harder)(Shorter upgrade time)

patience ;)


Put the 3.90m33-2 Updater in the folder:
Ms0:/PSP/GAME/UPDATE

Next Run the program and connect to the internet.

The rest it will do for you.

For the harder install:

Put the 3.90m33-2 Updater in the folder:
Ms0:/PSP/GAME/UPDATE

Put the 3.90 Official FW upgrade in the folder:
Ms0:/PSP/GAME/UPDATE

Rename that file to: 390.PBP