if this dnt work message me i will send the files you are missing
1st: You go to the PS menu. go under game, go to the top under game data utility, click on that then find the mw2 patch. delete it. start up mw2 again. download the patch again. back out go back to your File Manager and go under dev_hdd0, Game, then you find your Mw2, then click it, go under USRDIR then copyyour patch your patch like you would always do. Then start up Mw2 and you should have your challenge lobby back. ( If you dont understand message me and ill put up a video) HOPE THIS HELPED!!
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