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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

New to flashtool

If i use flashtool and flash a differnt region and leave it like that will i get ota upfates still i have a z5 e6653

Yes, you will get the OTA updates for the region you flashed.

Thank you

If i can ask you another question my sony z5 e6653 came with 1299-3035 region firmware i cant find what region it was is there any way of finding out that firmware was for lolipop thank you

Are you sure about 1299-3035? I can't find any reference to that anywhere.
How to find Customization Version

I think this is the region firmware

No idea where that's from. Where did you buy it? And is that the customisation version that displays in the phone's service menu?

I bought it from swappa i live in the usa so i wanted to have lte showing so i flashed custom de (germany) is that ftf file a true sony file or a made up one. I really am thankful for all your help.

SI number on box doesn't match the Customization Version in the phone. For the last time, what does version is this PHONE? Not the BOX, the PHONE.

Which Firmware is best for US Unlocked XZP G8142 to enable fingerprint unlock?

Hey guys. I recently bought a US unlocked Sony XZP from Best Buy. I want to flash the right firmware to enable fingerprint. Take a look at the list in the screenshot. For G8142 Dual Sim, there are lots of options available. I am not sure which one is best to flash. Have any of you guys tried and if so, which firmware? Thanks

Flash Centra Europe 1.

can we flash indian firmware instead of CE1

[email protected] said:
can we flash indian firmware instead of CE1
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If it's available for the this model then I see no problem in doing it. If you find something not working you can flash back to the other firmware.

In the above screen shot Indian firmware is available I'm planning to flash that instead of CE1

[email protected] said:
In the above screen shot Indian firmware is available I'm planning to flash that instead of CE1
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That should be fine if that's the firmware you prefer.
Also any particular reason or advantages that you are planning to flash that over CE1 or others on the US model?

Nothing as such I'm just trying different region firmware other than CE1

Which firmware is best for faster ota updates and with Android Pay working? I'd flashed CE1 and there's no Android Pay. Any suggestions? Thanks in advance.

FartyParty said:
Flash Centra Europe 1.
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100% Agreed.
---------- Post added at 12:42 PM ---------- Previous post was at 12:41 PM ----------
JB2unique said:
Which firmware is best for faster ota updates and with Android Pay working? I'd flashed CE1 and there's no Android Pay. Any suggestions? Thanks in advance.
Click to expand...
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not by default, but you can download it and it works. I use mine all of the time

Which of the firmware available is best aside from CE1? It seems to be the slowest to receive security patches :/

The Customized FR one seems to get updates pretty quickly, but the CE1 hasn't been that late recently, it was only a couple days behind this time I think. I ended up using the combination of US and CE1 because I couldn't get group messaging to work with CE1 or FR with android messages.

Which files you mix to make.this combination? If i flash a Ce1 it keep going in auto reboot.

Can't flash over Japanese firmware to global model.

I'm revisiting a situation here because it just seems very odd. Japanese versions of the z5 premium can be flashed over to global with no issues but for some reason, global versions of the z5 premium can't be flashed over to Japanese firmware. It doesn't make any sense. I have an unlocked and rooted z5 premium E6853 and I've been trying to flash over to the Japanese firmware with no success. I can install custom firmwares just fine but this one doesn't seem to want to work. It's possible there could be some limitation built into the firmware that could be worked around but I don't have the knowledge to do this. If anyone would like to take a look at it, I would really appreciate it. I've uploaded the firmware here but you can also get it from xperiafirm.
https://drive.google.com/open?id=1zIFildZIjJ0rOrjm4ncnKTaraboQsFN2

3 UK firmware flashing options...

I have an XZ Premium (G8141) from the 3UK network. I want to use it in the US, likely as a WiFi only device. I want to flash the firmware to remove the 3UK branding. Trying to decide the best option. I don't really care about the fingerprint sensor working or not. If I did decide to use it on a mobile network it would be TMobile US.
I downloaded XperiFirm and for the G8141 there are a number of "Customized" options. If I went this way I imagine I would go with the Customized CE1 or UK version right? That would remove network customization and be a stock Sony firmware?
In the G8142 section there is a Customized US firmware. Is flashing this an option to get a US based firmware? What would be the negative side of doing this?
I appreciate any input. Thank you!

NickPDX said:
I have an XZ Premium (G8141) from the 3UK network. I want to use it in the US, likely as a WiFi only device. I want to flash the firmware to remove the 3UK branding. Trying to decide the best option. I don't really care about the fingerprint sensor working or not. If I did decide to use it on a mobile network it would be TMobile US.
I downloaded XperiFirm and for the G8141 there are a number of "Customized" options. If I went this way I imagine I would go with the Customized CE1 or UK version right? That would remove network customization and be a stock Sony firmware?
In the G8142 section there is a Customized US firmware. Is flashing this an option to get a US based firmware? What would be the negative side of doing this?
I appreciate any input. Thank you!
Click to expand...
Click to collapse
The only difference between the two customised versions is that the US one will have the fingerprint reader disabled.
Any customised firmware build will work, removing the 3UK logo, but avoid the US version if you use fingerprint unlock

Thank you for the response! Another question, are the Customized firmwares official Sony ones?