O. k. I know how to unlock the first nanosuit modules but I'm now wondering how you unlock the upgrades for the modules and are they also just the same cost or do they come in at different levels because right now I'm using the armor enhance and I have another armor upgrade available but it won't let me buy into that again. Do you have to be a certain level? Or is it another column I'm not looking at? I want the upgrade so your speed isn't affected when wearing armor. Any help is appreciated.

You have to gain XP points in order to unlock more upgrades. Also each gun will unlock certain upgrades depending on how many kills you get with that particular gun.. Its confusing to me to.. They should have made it a little more self explanatory in the game..

If you want upgraded modules you need to complete challenges with them such as getting an x number of kills while use the module.

Also if you want attachment unlocks you have to get an X number of kills with a weapon.