Create 8 man co-op lockdown party

Dear all,
I would like to create 8 man room for coop AI mission, i do search on our forum and i have read many tut about this problem, but i can't achieve that "glitch", when i choose AVA.exe in CE 6.1, the game shut down and gameguard report error on *.erf files, please can someone show me how to create 8 man room, many thanks to you all.

I doubt Cheat engine would work. And yeah AVA is hosted by ijji. And all the game rooms are server-sided so it's not possible.

thanks for your quick reply but i'm playing on AVA SEA, and yesterday i've joined a party lockdown extreme 8 man, so it's possible to do this glitchs, can someone show me please ?