Have a Rooted SM-G900A and want to go Stock, will i loose unlock?

Hello Forum,

I just realized that i bought a scam phone, they sold it as G900F and it really is a G900A.
Right now my is acting up, with random re-boots and bootloops. The phone is Rooted, and i'd like to un-root it and go stock.
I see that the only stock firmaware on SamMobile is the one i have 4.4.2, my question is, if i flash that one, will i loose the unlock?.
I currently can use any company's sim, will i loose that if i go stock?.

thanks so much for any pointers.
Javier.