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Is it possible to downgrade to different region and older firmware?

Hello, I currently have SM-G9208 S6 on 6.0.1 which is Taiwan model.
The problem is I live in Australia and with Vodafone and their current firmware for SM-G925I is 5.1.1.
The reason I want to use older firmware for Vodafone is to be able to use voLTE.
Currently I don't have voLTE option on my phone.
So can anyone help me out? Also if possible to I need to wipe everything out as well?
Thanks

http://justforprogrammers.blogspot.com/2015/12/downgrade-from-marshmallow-to-lollipop.html?m=1

Galaxy S6 SM G920I Indian(INU) Firmaware on SM G920F Uae(XSG) Phone

Is there any problem installing G920I firmware on G920F. I have S6 G920F XSG model bought from uae. Now i want to install indian firmware on it. But indian firmware only available in G920I model. Is it possible to install G920I INU in G920F XSG?
Please Help....!

sreesp said:
Is there any problem installing G920I firmware on G920F. I have S6 G920F XSG model bought from uae. Now i want to install indian firmware on it. But indian firmware only available in G920I model. Is it possible to install G920I INU in G920F XSG?
Please Help....!
Click to expand...
Click to collapse
no you will break your phone...you must flash only g920f for your phone and not g920i

Ok Thanks sir..
Is there any way to activate volte in my phone. Iam using Reliance Jio sim but volte only supports in indian firmware.
Data connection working perfectly.
I have a rooted s6..any way to activate volte??

From the below link I can I person has flashed G920I firmware on G920f and he says its working fine
http://forum.xda-developers.com/galaxy-s6/help/how-iin-enable-volte-g290f-t3355074/page4
How is this possible

sir, i as well have sm-920f. i also purchased from UAE as i stay here. however i am traveling to india soon and plan to get jio sim.
i read we need to install my jio apps to get the free sim. however its not happening for me . i dont get the app in playstore. after doing web access to play store i get msg the JIO app isn't available for my country. i just want to know how did you install the app ? where you in india with any other operator indian sim card (airtel, idea etc) ? or what was the process. pls pls let me know. i am curious cuz i dont option to install app and afraid i might not get the sim.

sreesp said:
Ok Thanks sir..
Is there any way to activate volte in my phone. Iam using Reliance Jio sim but volte only supports in indian firmware.
Data connection working perfectly.
I have a rooted s6..any way to activate volte??
Click to expand...
Click to collapse
brother,
i have same phone as yours sm-g920f xsg UAE phone. how did you manage to install myjio app ? i am getting msg "this item is not available for your countries device"
where you in india when you installed this app via playstore ? or anyother trick to get this app ?

has anyone successfully flashed the U firmware?

Penis

isn't all the version is called SM=-G950U?

I have!!! Everything working fine here... at least for what I need in my country, dont know about tHAT VOLTE and wifi calling etc etc.

need help, need to use thailand firmware to use wifi calling

hi,
could anyone teach me how to flash my XZs to thailand firmware.
i need to use the wifi calling.

Galaxy A8 VoLTE and VoWiFi features on the USA T-Mobile network

Folks,
I have Galaxy A8 UAE version in the USA with MNVO SIM-card which is working on T-Mobile network. Of course VoLTE and VoWiFi features are unavailable on my A8 because it has wrong CSC (which is XSG). As I understand I need to change CSC code to add the features to my phone. But... as Galaxy A8 is not released in the USA there are no A8 ROM with CSC appliacble for the US. I'm wondering if there are any other ways to change CSC to one which will work with T-Mobile VoLTE (my previous Nokia 6 US-version had both features working fine with the same MNVO SIM). Could someone help me with that?

Follow the directions it works

Unfortunately this has stopped working.

knyaz2051 said:
Folks,
I have Galaxy A8 UAE version in the USA with MNVO SIM-card which is working on T-Mobile network. Of course VoLTE and VoWiFi features are unavailable on my A8 because it has wrong CSC (which is XSG). As I understand I need to change CSC code to add the features to my phone. But... as Galaxy A8 is not released in the USA there are no A8 ROM with CSC appliacble for the US. I'm wondering if there are any other ways to change CSC to one which will work with T-Mobile VoLTE (my previous Nokia 6 US-version had both features working fine with the same MNVO SIM). Could someone help me with that?
Click to expand...
Click to collapse
If you rooted your device, you can install a TMB CSC from another Samsung phone if you know how.

I had this working I have lost call volume I have not yet got a fix for it.

I have gotten this to work but it sunlight stops working inverse new sound.
I will try to get a fix for this

Ok found fix
You must rooted .
If you still need help send me a message and I will give you the directions.

mchlbenner said:
Follow the directions it works
Click to expand...
Click to collapse
Guys,
Can I use the attached CSC for TMB?
Or anyone can share TMB CSC for nougart?
Thanks

I have fix you have to be rooted.
This will work N and O but on this you need whipe data for it to work and the boot is very slow once booted up it will have to update and this is slow after it get done updating it is very fast