Quote:5.50 Prometheus-4 Upgrade Guide by flofrucht.

Liquidzigong's Prometheus add-on for PSP custom firmware 5.50 GEN-D. Play the latest and greatest 6.XX-required games without any difficulty—no ISO patching or nothing.

It's only with 5.50 GEN-D3 and D2 compatible.
It's NOT for PSP 3000 or PSP 2000 with Datacode 8c.

Download:
http://www.megaupload.com/?d=88KB1GIR

Install:
*download and extract  the 5.50 prometheus archive
*copy 5.50 prometheus folder to psp/game
*run installer in your psp
*press x
*after the install is finished press again X

5.50  Prometheus-4 is installed =)

sorry that i can't record the 5.50 prometheus install :(

5.50 Prometheus v5 by hirmfaxi