Help me i need help with stuff on: MW2, W@W, COD4.

How come i cant host on MW2 anymore, i just put the patch on and when i load up the game and do the update it doesnt have the patch on it, before the update i could update it and the patch would still be on there, whats going on??? also is anyone else having a problem with cod W@W because it is saying there is a matchmaking error when i click on play online??? and another thing when i go on cod 4 and i click on force host and try to find an online lobby i dont connect to anyone, is it because no one plays it anymore or is it something else??

Also is there any way to get the dlc's for W@W on a jailbroken ps3 if they are not downloaded on the 3.55 playstation? if there is how can it be done??

i know there are a lot of questions but i would be very grateful if anyone could help, if it works i will even rep! ;)