From Unofficial Rom To An Official One | Redmi 3s

[DannyDEV]

So I made an order for Redmi 3S 2GB from Aliexpress, and I asked from the seller to ship it with the original rom... he said ok.
Today, I got the phone and found out he lied(He wants me to "understand him"(wt*?); installed a custom rom.

Is there anyway to install the official rom? without having the risk of locking the phone or bricking it?

Thanks.