You can't do challenge lobbies with a JTAG or RGH unless you're running a dev nand. All methods, as of early 5/24/12 are still unreleased, so yeah. No challenge lobbies for MW2.if you have a Jtag/RGH/Dev then you mod the game. E.g mw2, you add the dll and stuff (youtube for tut). then you connect your jtag to the your retail and start a system link game on your jtag, and then join with the retail. then bring you retail online and you can host.
Btw you cant infect others and you cant do challeng by system link atm
Read aboveCan anyone tell me how to infect an account over system link? I'm not very good with challange lobbies.