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Three & EE VoLTE on S8+ XEU/BTU firmware

Hi,
Has anyone been able to access Three and EE VoLTE on ether XEU or BTU firmwares? I am thinking of getting the S8+ Dual SIM but don't really want to have to flash a 3 branded firmware on a dual SIM model if I can help it.
Thanks.

Can't answer for dual SIM variant, but you can do it in a number of ways, you flash the three firmware and CSC, or you flash the EE firmware and CSC. Both will mean you get OTAs. I however used EE CSC and xeu rest of the firmware. I get the best of both worlds but have to manually update using a hybrid of the EE CSC and xeu rest.

I have flashed BTU firmware before with Three CSC but yes it causes a mismatch and OTA updates no longer work ;-(

No Multi-CSC after flashing Germany's Oreo firmware

Hello, I first bought my phone from Taiwan and the CSC was pointing to BRI(Taiwan) at first but now after flashing Germany's Oreo firmware by following the xda thread, it no longer shows anything in my avaliable CSC, I'm only getting CHO(Chile) and nothing else. Is there a possible fix? I also tried flashing Taiwans firmware for nougat but still ended up with CHO service provider.
Im trying to get back to stock Taiwan firmware because they now have oreo update and supports Samsung Pay while the Germany's firmware doesn't support at all.
Also I accidentally reset my phone with Canada's Sim card in while factory resetting once.
I've attached an image of my phone's CSC info
Any help is appreciated. Thank you
EDIT: another thing I noticed was my phone model changed from SM-G955FD to SM-G955F, is there any way to get it back to FD somehow? In my settings. About phone, it does say SM-G955FD still though

If you change the 'model' of your phone via a flash, you need to flash/change the CSC with the same 'model' of the OS you used.
If it seems a bit convoluted, I'd flash back to full OEM, and make sure that is all OK, and then flash the proper CSC package.

daffychuy said:
Hello, I first bought my phone from Taiwan and the CSC was pointing to BRI(Taiwan) at first but now after flashing Germany's Oreo firmware by following the xda thread, it no longer shows anything in my avaliable CSC, I'm only getting CHO(Chile) and nothing else. Is there a possible fix? I also tried flashing Taiwans firmware for nougat but still ended up with CHO service provider.
Im trying to get back to stock Taiwan firmware because they now have oreo update and supports Samsung Pay while the Germany's firmware doesn't support at all.
Also I accidentally reset my phone with Canada's Sim card in while factory resetting once.
I've attached an image of my phone's CSC info
Any help is appreciated. Thank you
EDIT: another thing I noticed was my phone model changed from SM-G955FD to SM-G955F, is there any way to get it back to FD somehow? In my settings. About phone, it does say SM-G955FD still though
Click to expand...
Click to collapse
Firmwares for SM-G955F and SM-G955FD are IDENTICAL, your model number has not changed. To change CSC I had to install FW with new CSC, then do factory reset and after first boot I got prompted whether I want to change my CSC (based on inserted SIM card), confirmed, the phone did factory reset again and got new CSC installed. Also, Canada is not included within OXM multi-CSC package as G955F/FD is not sold there (or at least not officially).

kernel.killer said:
Firmwares for SM-G955F and SM-G955FD are IDENTICAL, your model number has not changed. To change CSC I had to install FW with new CSC, then do factory reset and after first boot I got prompted whether I want to change my CSC (based on inserted SIM card), confirmed, the phone did factory reset again and got new CSC installed. Also, Canada is not included within OXM multi-CSC package as G955F/FD is not sold there (or at least not officially).
Click to expand...
Click to collapse
JeffDC said:
If you change the 'model' of your phone via a flash, you need to flash/change the CSC with the same 'model' of the OS you used.
If it seems a bit convoluted, I'd flash back to full OEM, and make sure that is all OK, and then flash the proper CSC package.
Click to expand...
Click to collapse
Thank you both for your help. I'll try and flash just the CSC firmware then reset when samsung decides to push the OTA again and will see if that solves it. The firmware for Taiwan came out only a few days before they took it out so didn't have a chance to download it.

Canadian s7 not recognizing getting network with a european sim card.

So I've bought a second hand galaxy s7. It is a Canadian model SM-G930W8 . I live in Greece and have to use a greek sim card , the phone recognizes the sim card , but in the info it says unknown. Prior to an update I made it worked fine , but after the software update I am unable to get network reception . Anybody happens to know a way to fix the problem ? Will flashing a greek firmware solve the issue ?

You can try flashing just the home_csc, which contains carrier and frequency settings, from the Greek firmware onto your G930W8, but I'm not sure how different the 930W8 is to the 930F so you might risk a bootloop and have to flash stock. So make sure you've got what you want backed up.

What was the source of the update? Phone shows the correct IMEI?
I believe the 930w8 is exclusive to Canada.

audit13 said:
What was the source of the update? Phone shows the correct IMEI?
I believe the 930w8 is exclusive to Canada.
Click to expand...
Click to collapse
Yes it's a Canadian variant. .
---------- Post added at 07:19 AM ---------- Previous post was at 07:15 AM ----------
leodiavata said:
So I've bought a second hand galaxy s7. It is a Canadian model SM-G930W8 . I live in Greece and have to use a greek sim card , the phone recognizes the sim card , but in the info it says unknown. Prior to an update I made it worked fine , but after the software update I am unable to get network reception . Anybody happens to know a way to fix the problem ? Will flashing a greek firmware solve the issue ?
Click to expand...
Click to collapse
Somehow the update messed it up? Is it a stock update from Canada? I have a Canadian s7 from bell on 7.0

I updated the phone from samsung smart switch , the phone was probably modded beforehand to run greek sim cards, and the seller never mentioned this.And with the update the mod was most likely wiped or something.

leodiavata said:
I updated the phone from samsung smart switch , the phone was probably modded beforehand to run greek sim cards, and the seller never mentioned this.And with the update the mod was most likely wiped or something.
Click to expand...
Click to collapse
Try a different stock from sammobile or a Greek rom. But there shouldn't be that issue. Mine works in London with no problems.

I asked about the imei to ensure that the phone is showing the correct imei.
The model number has been confirmed in download mode?

Yeah I went in download mode and it is the one I have stated above , same model number on the back of the phone , I will check the imei when I get a hold of the phone , because a friend has it right now. Will try to flash greek firmware. And report back.

I booted into recovery and what is said there
-- applying multi-csc...
Applied the csc-code : TLS
successfuly applied multi-csc
That means that the phone is using the Canadian Telus Home.csc (I guess) .
So would flashing the home.csc from the Greek firmware work ? Does it have a chance to hard brick the phone ?

CSC Changing Help

I have the G955FD on the BRI (Taiwan) firmware. I live in Australia, and really want to use Samsung pay. How should I change my CSC from BRI to XSA? I've seen varying information here and on other sites. I want to keep my Google Play as Certified, still have OTAs and without tripping KNOX. Essentially like a standard phone from this region. I don't particularly care about Dual-SIM, but it'd be nice to still have.
Here is my current software information: imgur(dot)com/a/197z5 <-- I can't post links yet, remove this if not allowed.
Thanks for helping

jAyKEbAb said:
I have the G955FD on the BRI (Taiwan) firmware. I live in Australia, and really want to use Samsung pay. How should I change my CSC from BRI to XSA? I've seen varying information here and on other sites. I want to keep my Google Play as Certified, still have OTAs and without tripping KNOX. Essentially like a standard phone from this region. I don't particularly care about Dual-SIM, but it'd be nice to still have.
Here is my current software information: imgur(dot)com/a/197z5 <-- I can't post links yet, remove this if not allowed.
Thanks for helping
Click to expand...
Click to collapse
Hi mate
Without root there are not many options ..
First F and FD firmwares are compatibles ( same device!! exynos to exynos) , you can flash an F firmware into an FD or vice versa
you could try to change your CSC to your SIM card CSC first
Check here
On the thread it shows how to add your SIM CSC to your current CSC config , if it work you may end up with a configuration like BRI/BRI/XSA , in my case I got TPA/TPA/PCW , TPA was the software default and PCW sims CSC. I do not have Samsung pay so i do not know if that change will be enough to make it work. Back up you need to factory reset for this.
The other option is to flash a full XSA firmware ( use a G955F firmware) , read here how to do it
BACK UP before you do anything

MAX 404 said:
Hi mate
Without root there are not many options ..
First F and FD firmwares are compatibles ( same device!! exynos to exynos) , you can flash an F firmware into an FD or vice versa
you could try to change your CSC to your SIM card CSC first
Check here
On the thread it shows how to add your SIM CSC to your current CSC config , if it work you may end up with a configuration like BRI/BRI/XSA , in my case I got TPA/TPA/PCW , TPA was the software default and PCW sims CSC. I do not have Samsung pay so i do not know if that change will be enough to make it work. Back up you need to factory reset for this.
The other option is to flash a full XSA firmware ( use a G955F firmware) , read here how to do it
BACK UP before you do anything
Click to expand...
Click to collapse
Thank you very much! I'm now running XSA/XSA/XSA with a flash. Dual-SIM support is still there which surprised me. There were some issues with Odin, but I fixed them up after a while.

jAyKEbAb said:
Thank you very much! I'm now running XSA/XSA/XSA with a flash. Dual-SIM support is still there which surprised me. There were some issues with Odin, but I fixed them up after a while.
Click to expand...
Click to collapse
Great news mate!!
Firmware is 100% same for F and FD so you should not see any difference at all , I asume also you got Samsung Pay working.
Good job!

I did the same when I had s8+. flashed TEL (Telstra) SM-G955F firmware which I got off Sammobile and worked like a treat. Samsung pay, VoLTE, Wifi Calling, Spam detection in calls worked as well.
I upgraded to S9+ and tried to do the same. The flash process works fine but CSC doesn't change. I am stuck on AFG CSC. Apparently it cant be done on S9 as Samsung is imposing multi CSC format.
Well, you are lucky one to have S8+. Enjoy

maximus81 said:
I did the same when I had s8+. flashed TEL (Telstra) SM-G955F firmware which I got off Sammobile and worked like a treat. Samsung pay, VoLTE, Wifi Calling, Spam detection in calls worked as well.
I upgraded to S9+ and tried to do the same. The flash process works fine but CSC doesn't change. I am stuck on AFG CSC. Apparently it cant be done on S9 as Samsung is imposing multi CSC format.
Well, you are lucky one to have S8+. Enjoy
Click to expand...
Click to collapse
That's unfortunate
I'm curious why you flashed TEL instead of XSA, XSA is the unlocked version and it still has WiFi calling, VoLTE etc. I have an ALDImobile SIM (which uses Telstra) but I installed the unlocked version to have minimal bloatware and the stock boot logo.

jAyKEbAb said:
That's unfortunate
I'm curious why you flashed TEL instead of XSA, XSA is the unlocked version and it still has WiFi calling, VoLTE etc. I have an ALDImobile SIM (which uses Telstra) but I installed the unlocked version to have minimal bloatware and the stock boot logo.
Click to expand...
Click to collapse
I tried both. First preference is always XSA but I tried TEL in anticipation that it may work
Sent from my SM-G965F using Tapatalk

Since CSC change is not possible with latest UI 3.1 update what are options to change CSC

HI all,
With CSC change not possible using codes with latest UI 3.1 update what are options to change CSC?
For ex. I have SM-N986U unlocked Tmobile device but i changed CSC to ATT as im currently using ATT Prepaid and I'm on latest Apr update for ATT
How can i revert back to Tmobile CSC?
Do i need to flash Tmobile firmware using ODIN by first flashing to U1 firmware then Tmobile firmware or can i directly flash Tmobile latest firmware with Apr update using ODIN?
Will i be able to retain my app and data if I flash Tmobile firmware?
Any help will be appreciated.
Thanks

So you state csc change not possible then ask how to change it? lol.. and if it were as easy to just flash firmware in odin tgen that wouldve been the way to do it to begin with I would think lol

Update:
I was able to change CSC(ATT/ATT/TMB) to TMB/TMB/TMB but it was long and winded way. Just flashing firmware was not enough , need Tmobile sim to install carrier service and change CSC.
I followed the steps below:-
1) Did backup of my device using Smart Switch and removed my ATT sim.
2) Flashed latest T-Mobile firmware( N986USQU2DUC8 ) using instructions from post - https://forum.xda-developers.com/t/ota-and-non-ota-firmware-for-n986u-and-n986u1.4143833/ . Also, downloaded the ODIN (patched version) and T-Mobile firmware from links in the post. Flashed HOME_CSC too.
3) After rebooting phone with new firmware , the boot up screen was still ATT and CSC was still ATT/ATT/TMB.
4)Shut down phone and inserted Tmobile SIM i had lying around.
5) On reboot, i was asked to install Tmobile carrier services and on restart , Tmobile logo came on boot up with CSC changed to TMB/TMB/TMB.
6) Now, i have esim enabled and SIM manager showing up too.

mindseye0803 said:
Update:
I was able to change CSC(ATT/ATT/TMB) to TMB/TMB/TMB but it was long and winded way. Just flashing firmware was not enough , need Tmobile sim to install carrier service and change CSC.
I followed the steps below:-
1) Did backup of my device using Smart Switch and removed my ATT sim.
2) Flashed latest T-Mobile firmware( N986USQU2DUC8 ) using instructions from post - https://forum.xda-developers.com/t/ota-and-non-ota-firmware-for-n986u-and-n986u1.4143833/ . Also, downloaded the ODIN (patched version) and T-Mobile firmware from links in the post. Flashed HOME_CSC too.
3) After rebooting phone with new firmware , the boot up screen was still ATT and CSC was still ATT/ATT/TMB.
4)Shut down phone and inserted Tmobile SIM i had lying around.
5) On reboot, i was asked to install Tmobile carrier services and on restart , Tmobile logo came on boot up with CSC changed to TMB/TMB/TMB.
6) Now, i have esim enabled and SIM manager showing up too.
Click to expand...
Click to collapse
thats the normal process.. that firmware is same for each carrier.. firmware is multi csc which changes based on sim inserted.. shouldnt have to go through all of that really.. i think most ppl who have issues are trying to change csc without a active sim card or on carrier locked devices etc.
glad u figured it out tho!

elliwigy said:
thats the normal process.. that firmware is same for each carrier.. firmware is multi csc which changes based on sim inserted.. shouldnt have to go through all of that really.. i think most ppl who have issues are trying to change csc without a active sim card or on carrier locked devices etc.
glad u figured it out tho!
Click to expand...
Click to collapse
Well, the confusion for most ppl who are new to Samsung and CSC, like me , is that we could change CSC with code earlier and now cannot. Didn't have these issues with pixel and iPhone.

mindseye0803 said:
Well, the confusion for most ppl who are new to Samsung and CSC, like me , is that we could change CSC with code earlier and now cannot. Didn't have these issues with pixel and iPhone.
Click to expand...
Click to collapse
pixel and iphone dont have multi csc like samsung does.. just curious, when were u able to change csc with code earlier if ur new to samsung? lol

elliwigy said:
pixel and iphone dont have multi csc like samsung does.. just curious, when were u able to change csc with code earlier if ur new to samsung? lol
Click to expand...
Click to collapse
Yes, I was able to change CSC to ATT from TMobile, enable all LTE/5G bands before One UI update.Not, sure what u find so funny .
Yes, I'm aware that there is no CSC concept in pixel or iPhone or any other other manufacturer that I'm aware nor they are crippled in terms of hardware capability from carrier software like Samsung. LTE/5G bands not being enabled , esim not being enabled etc.

mindseye0803 said:
Yes, I was able to change CSC to ATT from TMobile, enable all LTE/5G bands before One UI update.Not, sure what u find so funny .
Yes, I'm aware that there is no CSC concept in pixel or iPhone or any other other manufacturer that I'm aware nor they are crippled in terms of hardware capability from carrier software like Samsung. LTE/5G bands not being enabled , esim not being enabled etc.
Click to expand...
Click to collapse
actually other devices are crippled in some cased disabled entirely.. for example u cant get a tmb oneplus 9 pro 5g and use it on verizon to get 5g bcuz vzw 5g bands are disabled in tmb variant..
its really the carriers to be honest..
and I say LOL all the time even in normal convo so not actually laughing sometimes, just say it out of habit

elliwigy said:
actually other devices are crippled in some cased disabled entirely.. for example u cant get a tmb oneplus 9 pro 5g and use it on verizon to get 5g bcuz vzw 5g bands are disabled in tmb variant..
its really the carriers to be honest..
and I say LOL all the time even in normal convo so not actually laughing sometimes, just say it out of habit
Click to expand...
Click to collapse
I have phones such as Z Flip3 5G and other models that do not change CSC like older models when following the flash procedure starting with U1, but the phones never prompt a restart. I have noticed it seems to be with TMB or VZW units. Any suggestion on how to actually get the CSC to change properly or is this something they are doing with new phones to avoid being able to use them fully on other carriers?

yygemmi770 said:
I have phones such as Z Flip3 5G and other models that do not change CSC like older models when following the flash procedure starting with U1, but the phones never prompt a restart. I have noticed it seems to be with TMB or VZW units. Any suggestion on how to actually get the CSC to change properly or is this something they are doing with new phones to avoid being able to use them fully on other carriers?
Click to expand...
Click to collapse
SamKey.org
Go to the page, download theirs Samkey app, buy few credits on Ebay and you can change the CSC as you wish in a minute, the phone will reboot without loosing your data, it's the easiest way as far as I know

Hi, I have yhe following issue and I need your thoughts please.
I have a Telus plan, canadian with US roaming option.
I am traveling in US alot. I have a Note 20 Ultra U1 from Samsung USA. When in US I can only register on Tmobile and I can get 5G icon too. Won't let me on ATT or Verizon.
With same sim card in Note20 Ultra "W" variant, canadian one, it wil register on all 3 major networks in US. No issues with the sim, I guess.
Also in Canada won't get 5G ever.
My provider said nothing to do with them, Samsung told me the same.
I reseted all network setings my APN is ok. VOLTE on. Only getting acces to Tmobile.
Any ideea how I can fix this ? Is it related to CSC ? Mine is XAA.

mindseye0803 said:
Update:
I was able to change CSC(ATT/ATT/TMB) to TMB/TMB/TMB but it was long and winded way. Just flashing firmware was not enough , need Tmobile sim to install carrier service and change CSC.
I followed the steps below:-
1) Did backup of my device using Smart Switch and removed my ATT sim.
2) Flashed latest T-Mobile firmware( N986USQU2DUC8 ) using instructions from post - https://forum.xda-developers.com/t/ota-and-non-ota-firmware-for-n986u-and-n986u1.4143833/ . Also, downloaded the ODIN (patched version) and T-Mobile firmware from links in the post. Flashed HOME_CSC too.
3) After rebooting phone with new firmware , the boot up screen was still ATT and CSC was still ATT/ATT/TMB.
4)Shut down phone and inserted Tmobile SIM i had lying around.
5) On reboot, i was asked to install Tmobile carrier services and on restart , Tmobile logo came on boot up with CSC changed to TMB/TMB/TMB.
6) Now, i have esim enabled and SIM manager showing up too.
Click to expand...
Click to collapse
So I have a Verizon phone and I switched to t-mobile. If I use this method to switch my csc would that lock my phone or would it stay unlocked?

Stevieboy02008 said:
So I have a Verizon phone and I switched to t-mobile. If I use this method to switch my csc would that lock my phone or would it stay unlocked?
Click to expand...
Click to collapse
Unlocked. Phone once unlocked will not lock to any carrier.

dadmi said:
Unlocked. Phone once unlocked will not lock to any carrier.
Click to expand...
Click to collapse
Thank you