Could someone please help

So i just gkt the general knoxx dlc and i figured ide run theu the armory till i got to the last mission that u can reenter BUT i would up coming to close to the elevator and not it wont let me complete the mission if nekne has a lvl 67 character and can finish that quest with me on please hmu please therez no way i wanna make a whole noter character just to run this one mission

Im on xbox 360 if neone has this mission open or has any solutions besides findion someone online or making a completely new character please let me kno