Redmi Note 3 (sd) - Wanna Replace Seller Rom

Apr 10, 2016
Hi all,

I got my redmi note 3 pro.
I have stable ROM Who came with the phone from the store. I Have many problem with connectivity to cellular network.

Im Planning (and wanna) to install the officail Xiaomi global. (V7.1.8.0.LHOMICL)
I tried updating method through phone app, It didnt work.

Do I need to unlock the phone?
Can I flash official Global ROM without unlocking? through fastboot or other way? (when im in recovery mode Mi suite give me only the Chineze Rom)

Thanks in advance.