Reason why you can't fight without an installer device (combat OS)
・The energy transfer trigger to mobile armaments won't switch on
・The safety device for avoiding contact accidents won't be disengaged

According to FOOLYPEDIA’s explanation,
V-440
A cartridge used in Gundam
(Probably equivalent to an educational computer in the GQuuuuuuX world)

WG-X22100
A complete imitation of the V-440. Enhanced performance even in Zeon MS

It’s believed that what Nyaan was carrying was that unofficial copy