Installing another country's Firmware

[mahi1509]

I'm using SM-G781B (S20 FE 5G ) in India. Everyone know it is launched in MARCH 2021 withANDROID 11 in India. Same Device, same model, same SOC, launched earlier in some Europe countries but withANDROID 10.

***I prefer ANDROID 10 over ANDROID 11.

My Question is...

If I Install another country's Firmware in my phone, will it work?? Or will it break my phone?? My SIM card work with that firmware? 

I got one of Europe countries Firmware insamfw.com site.

Launched with Android 10 in Europe

Launched with Android 11 in India

[RαʝҽʂԋKυɱαɾ21]

NOT AT ALL
THIS CAN BRICK YOUR DEVICE !

[mahi1509]

Did you ever tried before?

[RαʝҽʂԋKυɱαɾ21]

SAMSUNG NOT ALLOWS TO DOWNGRADE
FIRMWARE HAVE IT'S SPECIFIC CSC
WHICH IS CODE OF COUNTRY IT'S BELONG OR MADE FOR THAT

NO ,I DON'T HAVE DONE THIS

COMMENTED AS KNOWLEDGE OF THAT

[mahi1509]

We can downgrade using ODIN3

[RαʝҽʂԋKυɱαɾ21]

TWO RESULTS
1 DEVICE BRICK
2 SUCCESSFULL

[mahi1509]

What happens BRICK means?

[RαʝҽʂԋKυɱαɾ21]

BRICKED DEVICE WON'T POWER ON THE FUNCTION NORMALLY. A BRICKED DEVICE CANNOT BE FIXED THROUGH NORMAL MEANS

IF IT'S SOFT BRICK IT MAY NEED TO UNBRICK USING SPECIFIC SOFTWARE TOOLS

IN SHORT
PHONE CAN BE TURNED INTO JUST PAPERWEIGHT

IT CAN BE POWER ON AGAIN AFTER
REPLACEMENT OF MOTHERBOARD ONLY

[BVikram]

I am not sure about different country firmwares, but long back I am sussufully able to downgrade my Samsung S2 Indian firmwares. I think success rate will be less or may brick the device. You may face network signal issues due to unsupported network band's parameters CSC.

[PrateekPriyadarshy]

S2 you mean S2?🤔