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: DO NOT attempt to install this on PSP-3000 / PSP-2000 TA088v3. YOU WILL BRICK YOUR PSP IF YOU DO.
Requirements:
- 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: 5.50_Prometheus.zip
- 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 5.50_Prometheus.zip 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.
After installing 5.50 GEN-D4, How about some Free PSP Games?
Troubleshooting
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:
Features:
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:
KHBBS
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.
FAQ:
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.
Updated:
Prometheus module and has been used to improve the game’s compatibility
Credits:
Liquidzigong – Prometheus Module
Genyus – By GEN
Tagged with: 5.50, 5.50 Prometheus, Custom Firmware, How to install 5.50 GEN-D4, How to install 5.50 Prometheus, Prometheus module
Filed Under: Playstation Portable

Ay yo atma. I know this might not be the best place to ask this but i have two questions…
1. Is there a way to play a video that is in .avi Format in my PSP??
2. Is there a way to open a .pdf file in my PSP??
I know that you can convert .avi to PSP to watch it. The program is called “XviD4PSP”. So technically it DOESN’T allow .avi files to play, but rather it converts them to a playable format. As for the .pdf functionality I am yet unaware. But if you do find out please let me know…I been looking for the same thing!
I’ve found a software named “Bookr” tht opens up .pdf files…
I’ve tested it and it works…though im still looking for tht .avi one
heh.. found bookr as well
. Will do a post in a bit
Hey Atma, why the new Prince of Persia doesn’t work on this patch?
sorry can u help me?after i download the prometheus 5.50 and 5.50 gen d-3 my psp wont read the memory stick/duo and if i want to format it, it’s always says format error, any ideas?
THX
Try formattng your memory stick on a computer. Looks like a bad memory stick.
So 5.50 Prometheus is like an update to 5.50 Gen-D3? If I update mine to Gen-D4, it should be able to play the newer games and old games right?
And thanks for posting this.
Yep. But some of the much older games (like those that came out in 3.xx era) seem to have problem with 5.50 GEN in general. At that point the only option is to juggle your firmware version (upgrade and downgrade).
is the PSN and PS store still still blocked on this firmware?
Yep. You can use a plugin that allows access to PSN however
umm sir slyv3rblade if i update to this version will i be able to play kingdom hearts birth by sleep? How are procedures ?and is there an english version of khbbs?
Yep, just make sure you have 5.50 GEN-D3 before installing the add-on. As for the english version for Birth by Sleep, that’s still in the works but a US release date has been announced so it’s just a matter of time
More info: http://www.atmaxplorer.com/2010/03/kingdom-hearts-birth-by-sleep-gets-us-release/
Hi… Uhm… 5.50 Prometheus seems to have a problem when I play YS seven. The problem is it has no sound when I play the game… Does this mean do I have to upgrade my firmware?
yo! i have a psp 2006 and its newer version is 5.03 GEN C. it is the blue madden edition. i use chick hen whenever i restart it. can it be upgraded to gen d3 and then to 5.5 prometheus? thanks.
Please check if your PSP is hackable or not before proceeding with any installation:
http://www.atmaxplorer.com/2009/03/how-to-check-if-your-psp-can-have-cfw-installed/