(This new custom firmware from GENyUS is ONLY for PSP-1000 (fat) and PSP-2000 (slim).
DO NOT attempt to flash or install CFW 5.50 GEN-A on a PSP-3000 or TA-088v3 hand-held. You will render your PSP a useless brick.

What you need:

• A PSP-1000 or 2000 v1 or v2
• A PSP running CFW 3.52 M33 or higher  (here are instructions on how to do so)
• This file

Instructions

 

1. Unzip the archive you downloaded. You will unzip a folder called UPDATE.

2. Connect your PSP to your PC, and copy the UPDATE folder you unzipped onto your PSP, into the PSP/GAME/ folder on your memory stick. (So you should now have an UPDATE folder inside the GAME folder, which is inside the PSP folder)

3. Disconnect the PSP from your PC.

4. Goto the Game menu on your PSP, and run the Updater (should be the first entry)

What you get:

• All features of official firmware 5.50
  
• Launch UMDs / ISOs / CSOs and demos requiring 5.50 or below
• Launch homebrew
• Launch PSOne (POPs) games
• Access to recovery mode (change CPU speed, enable/disable plugins, registry hacks, flash access, etc…)