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Install PSP Custom Firmware 5.50 Prometheus add-on

Even with 5.50 GEN-D3 installed on your PSP, you won’t be able to play some of the newer games without proper patching or plugin to help bypass Sony’s new DRM which requires 6.20 OFW. Luckily, Liquidzigong created Prometheus Module so that users with 5.50 GEN-D3 firmware (meaning COMPLETELY hackable PSPs) can still enjoy the latest game releases without any patching involved. With this guide, I’ll be showing you how to install the 5.50 Prometheus firmware add-on.

For ease of identification, Liquidzigong says you can also call this release as 5.50 GEN-D4.  For the purposes of this post I’ll be referring to this release as both 5.50 Prometheus and 5.50 GEN-D4.

Important: This only for hackable PSPs. Not sure? Read: Is my PSP hackable?

Update: The Prometheus-3 add-on is now available.

  • A PSP with custom firmware 5.50 GEN-D3 installed. If your firmware version is below this, please update to 5.50 GEN-D3.
  • PSP battery that’s at least 78% full
  • Download:
  • Disable ALL plugins.
  • Back up your save files (so that if they get corrupted, you still have backups)

How to install 5.50 Prometheus GEN-D4 add-on

  • Connect your PSP to your computer
  • Extract the to your PC
  • Copy the 5.50_Prometheus folder to X:/PSP/GAME/ on your PSP’s memory stick. (Where X is the drive that your PC recognizes your memory stick)
  • On your XMB, go to Game > Memory Stick to start 5.50 Prometheus Updater
  • Continue to install the official 5.50 Prometheus CFW when prompted
  • After all process is complete, press X. Your PSP will reboot.
  • Congratulations, you’ve just installed 5.50 Prometheus add-on on your 5.50 GEN-D3 or simply 5.50 GEN-D4.

Important: This release is currently 5.50 Prometheus v4.  Stay updated by subscribing to our feeds.
Update: The Prometheus-3 add-on is now available.
After installing 5.50 GEN-D4, How about some Free PSP Games?


In case of problems you can go back to 5.50-GEN-D3, just simply the proper XGen updater again. If all else fails, you will need a Pandora Battery to revive your PSP.

You can post problems you’ve encountered here.

Developer Note

Developer’s note:


It allows you without any modules, plug-in situations like the game to run 6.20. Procedures have been in the PSP-1003 & PSP-2000 on the test successfully.

Known to the normal operation of the original ISO:


MGSPW (Prologue do not crash)

Not known to the normal operation of the game:

patapon 3 DEMO

Thank GEN Team. This version of the vast majority of files from the 5.50 GEN-D3, you can call it 5.50 GEN-D4.


Q: Why does the game start screen to turn red?

A: Yes, when adding the code to decrypt the original GEN-C is changed purple. In my firmware in a red, made in China.


Prometheus module and has been used to improve the game’s compatibility


Liquidzigong – Prometheus Module

Genyus – By GEN

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