Hey guys, XBeastlyFreshX here with the tutorial for Pro C CFW and Pro Online Client 0.10, which allows you to play games online through AdHoc.
Pretty simple tutorial. I'm sorry if you can't hear me, since I was talking pretty low, but just turn your volume up, if you still can't, just ask and I will tell you.

Need PSP 2000/3000/Go. NO 1000! Need firmware 6.20/6.35/6.39/6.60

There are other tutorials, but this, to me is the most up to date, and easiest.
Others that I have seen, are like updating Pro-B cfw with Nightly Builds, which confused me, and might confuse you. So, this one is with Pro-C Cfw, which is a whole new cfw made by Pro Team released a couple days ago.

All credit to Coldbird for making the online client, and to Pro Team for making the cfw.

I AM NOT RESPONSIBLE IF YOU MESS UP/BRICK YOUR PSP IN ANY WAY.

UPDATE: UMDs WORK! The way to make them work is to go to Settings (On XMB), then to System Settings, and then find UMD Cache, and turn that off. Just like you turn off ISO Cache in Recovery Menu, turn off UMD Cache in System Settings. I tried SOCOM FTB3 UMD and it worked, got connected, and saw that 1 person (Being me) was online when I checked server status. Tried 3 other UMDs and they started up (Usually, UMDs freeze upon booting if you don't turn off UMD Cache) but didn't connect, probably because the titles weren't supported.

COPY/PASTE THIS IN GAME.TXT FILE:
ms0:/seplugins/atpro.prx 0

For PSP Go INTERNAL MEMORY ONLY:
ef0:/seplugins/atpro.prx 0

LINKS:

Prometheus Online Client 0.10 (recently released, also same installation):

6.60

6.3X

6.20

Pro-C CFW [UPDATED]
6.60

6.39

6.35

6.20

Link to Server status:
Link to Prometheus Community forums:
Link to list of compatible games: