They scale to the lvl you are when you > first < acquire them. This is a MASSIVE problem with the legendary monowire as you can freely and easily nab this at sub lvl 10 before even doing the Heist main mission. Free mantis blades, they are guarded by a lvl 30 boss mob, but still a problem when you start hitting lvl 45+ mobs.
You can not sell cyberware, you can not craft cyberware, you can not upgrade cyberware. Once acquired, that is it, you are stuck with it.
You can not sell cyberware, you can not craft cyberware, you can not upgrade cyberware. Once acquired, that is it, you are stuck with it.