Ok so I got my samsung galaxy s4 through a buddy upgrade in october, I have sprint.

He had this shit rooted and deleted the stock recovery from the phone and put a stock rom on it

I constantly have a prompt to update my phone, and i really want to because is crashing a lot

(you need an account to see links)

If i do this, will I be able to download all of the updates?

Any help is appreciated..

I have no idea what i'm doing