Flash Lollipop in Samsung A5 which is region lock.

Hi Guru's,
I have purchased Samsung Galaxy A5(SM-A500F) from Saudi and I used Local sim to unlock the Region Lock. I am using this Mobile in India.
Now I Planned to flash Lollipop on A5 which samsung is released for UK.
I need your help to clarify below details.
Can I flash the Lollipop Stok Firmware which is released for UK?
Will I losse the Region Unlock by flasing new Lolliop firmware?.

Thanks in advance.

with Thanks,
Devadas AN