Develop Bugs

Switching from ATT to TMobile, questions inside

Hello, I'm currently using a Galaxy s9+ on ATT and plan on switching to Tmobile this week. Besides unlocking the phone do I have to do anything else for the phone to take advantage of TMobile? Do I have to flash TMobile firmware or anything like that in order for the phone to work properly and if so how, I've been out of the flashing game for a LONG time .

No you don't have to flash t mobile rom as I know when you put a new sim the phone reboots and sets the phone up for that carrier that's what it does on my s9 but mine the unlocked one so I got wifi calling with t mobile sim card in my phone

T mobile
The screen shots should show up

same boat but need to flash TMB image
okay hear's the deal, i am in the same boat moved to T-Mobile few days back and i have a Vzw branded S9+. i was of the opinion that things would workout great, but my area has poor t-Mobile network and i have been unsuccessfully attempted to flash TMB firmware on this phone. I have tried just about all combinations, and every-time the flash is done it boots back as a brand new Vzw phone and looks for a Vzw sim. I insert the TMB SIM and things work but not WIFI calling. Any leads?

riyengarxda said:
okay hear's the deal, i am in the same boat moved to T-Mobile few days back and i have a Vzw branded S9+. i was of the opinion that things would workout great, but my area has poor t-Mobile network and i have been unsuccessfully attempted to flash TMB firmware on this phone. I have tried just about all combinations, and every-time the flash is done it boots back as a brand new Vzw phone and looks for a Vzw sim. I insert the TMB SIM and things work but not WIFI calling. Any leads?
Click to expand...
Click to collapse
What odin you use??

1.13.1 patched.
---------- Post added at 02:54 AM ---------- Previous post was at 02:51 AM ----------
Some more details if that helps..
Paid $24 to Sammobil, went through the flashing process and nothing changed. Did this almost 5 times but seems VZW keeps haunting me. Am I doing something wrong? I downloaded the latest firmware RB8 from Aug 2018 for TMB via sammobile flashed the 4 files AP, BT,CP and CSC. Everything went perfect but when it boots back Damn the same old VZW and the OS says u have a non vzw sim. I even flashed the userdata with the other four and separately but no luck. Do we have any success stories and how we dis this correctly? Using Odin 1.13.3 patched version. Tried to downgrade but that failed.

Use 3.13 I believe

Rally517 said:
Use 3.13 I believe
Click to expand...
Click to collapse
Yes sorry typo error, 3.13.1_3B

Not trying to start a new thread with something similar so I'm just gonna post underneath this one. I have an AT&T S9 that is sim unlocked and all but, for the life of me I can't get it to work on Verizon. I've tried changing the bands in the *#*#3696#*#* menu and all I get is, is data. I tried flashing ARG7 unlocked I believe and it still booted with all the AT&T stuff loaded. The build number now shows ARG7 instead of ARG8. I don't know if there's a specific odin / firmware I need to flash in order to be able to get it right. I've been hunting for hours and flashing and I'm at a loss. Thank you guys in advance.

riyengarxda said:
okay hear's the deal, i am in the same boat moved to T-Mobile few days back and i have a Vzw branded S9+. i was of the opinion that things would workout great, but my area has poor t-Mobile network and i have been unsuccessfully attempted to flash TMB firmware on this phone. I have tried just about all combinations, and every-time the flash is done it boots back as a brand new Vzw phone and looks for a Vzw sim. I insert the TMB SIM and things work but not WIFI calling. Any leads?
Click to expand...
Click to collapse
All the carrier stuff is located in the CSC from the flash.
Side note: from what I've read, Verizon locks down the bands and whatnots that stop TMobile stuff from functioning, like WiFi calling.
I've seen people get it working but not the video calls.

thegreatkazoo said:
All the carrier stuff is located in the CSC from the flash.
Side note: from what I've read, Verizon locks down the bands and whatnots that stop TMobile stuff from functioning, like WiFi calling.
I've seen people get it working but not the video calls.
Click to expand...
Click to collapse
Thanks, I really don't care about video calls but WIFI calling is a real need.. any leads?

thegreatkazoo said:
All the carrier stuff is located in the CSC from the flash.
Side note: from what I've read, Verizon locks down the bands and whatnots that stop TMobile stuff from functioning, like WiFi calling.
I've seen people get it working but not the video calls.
Click to expand...
Click to collapse
All my functions work. Video calling etc etc. Unlocked s9. First I az on Boost mobile. Switched to metro. Flashed tmb everything works.

riyengarxda said:
Thanks, I really don't care about video calls but WIFI calling is a real need.. any leads?
Click to expand...
Click to collapse
There a thread around here that talks about how to get the TMobile services but WiFi calling is all they could get to work. You have to flash the CSC (home partition) from TMobile is what I've heard. I've also heard, you can put in a TMobile Sim and it'll just work. But, I think that might be limited to "factory unlocked" phones.

thegreatkazoo said:
There a thread around here that talks about how to get the TMobile services but WiFi calling is all they could get to work. You have to flash the CSC (home partition) from TMobile is what I've heard. I've also heard, you can put in a TMobile Sim and it'll just work. But, I think that might be limited to "factory unlocked" phones.
Click to expand...
Click to collapse
Do you have the thread link? I tried just about as many I could read up..

riyengarxda said:
Do you have the thread link? I tried just about as many I could read up..
Click to expand...
Click to collapse
I'm at work but I'll be off in a bit and I'll hunt it down once I get home.
If I'm not mistaking, it's the one that talks about flashing the u fw to the u1.

riyengarxda said:
Do you have the thread link? I tried just about as many I could read up..
Click to expand...
Click to collapse
https://forum.xda-developers.com/ga...n8-s8x-s9x-oreo-usa-t-mobile-efs-csc-t3772385
Here you go. There's a version 3 on OP web site. Look up my posts there.

Docmjldds said:
https://forum.xda-developers.com/ga...n8-s8x-s9x-oreo-usa-t-mobile-efs-csc-t3772385
Here you go. There's a version 3 on OP web site. Look up my posts there.
Click to expand...
Click to collapse
Read through all the 16 page thread and found very useful comments from you on usage of V3 detonator and Csc changer. I stand confused over just 2 questions;
1. Do I have to root my s9+ which is from vzw
2. It talks about F and FD variant while I have a u variant running snapdragon.
Show me some light .:angel:

riyengarxda said:
Read through all the 16 page thread and found very useful comments from you on usage of V3 detonator and Csc changer. I stand confused over just 2 questions;
1. Do I have to root my s9+ which is from vzw
2. It talks about F and FD variant while I have a u variant running snapdragon.
Show me some light .:angel:
Click to expand...
Click to collapse
I'm on Exynos S9 and rooted. Doubt this will work on a Snapdragon device. Sorry

Docmjldds said:
I'm on Exynos S9 and rooted. Doubt this will work on a Snapdragon device. Sorry
Click to expand...
Click to collapse
Yup exactly my taught... thank you for all the insights..

Last Resort Regarding Carrier Switching

I'd like to start off by apologizing if there's a thread that has answered this. I've spent nearly a week trying to find my answer because, I'm one of those that doesn't like duplicate post to begin with or those who don't google however, I can't find my definite answer and I just want to reassure before going and spending money.
Scenario: I recently have been given an AT&T Galaxy S9 and I'm mad in love with it (using an iPhone X at the moment lol) and I need it to work on Verizon. Of course my first step will be unlocking the device to be able to be used on different networks and I do by putting in the code that I received and it does unlock it. I proceed to put my sim card in it and I notice I can't seem to get service to work. I noticed giving my Note 8 Verizon to my friend who has AT&T, he could put his sim card in and it'll restart with all AT&T functions including the boot logo and all. My S9 AT&T rejects it still. I did try and tinker with the dial codes (*#*#4636#*#*) and setting my bands to LTE/CDMA. Doing this allowed me to receive 4G LTE on the device but, no cellular service. With that being said, I've read on threads that firmwares from certain manufacturers disable bands so I assume AT&T has those disabled that work for Verizon. My next step was trying to get a verizon firmware to work on it. I downloaded the ARG8 U firmware from verizon for it and it still boots AT&T firmware regardless. My last thought would be waiting for the updated V3 U1 Firmware for the S9 and maybe that'll fix it? I just need some opinions on this matter because, if I can't get this to work then I'm going to proceed on buying a new one unlocked.
Thank you guys in advanced and again, if there's already answers for this then I apologize. I've worked with android since the HTC Hero days and I still get stumped on some things haha.

megaghostgamer said:
Thank you guys in advanced and again, if there's already answers for this then I apologize. I've worked with android since the HTC Hero days and I still get stumped on some things haha.
Click to expand...
Click to collapse
Yes.. wait till XAA-U1 is available or an ATT firmware with userdata file inside which has all ATT related files.

nimms said:
Yes.. wait till XAA-U1 is available or an ATT firmware with userdata file inside which has all ATT related files.
Click to expand...
Click to collapse
When you say ATT firmware do you mean Verizon? I'm trying to convert from ATT to Verizon which I've tried a firmware with Verizon's userdata inside and all it did was double my bloatware lol. Had ATT and Verizon BS. As far as the XAA-U1, I understand then.

megaghostgamer said:
When you say ATT firmware do you mean Verizon? I'm trying to convert from ATT to Verizon which I've tried a firmware with Verizon's userdata inside and all it did was double my bloatware lol. Had ATT and Verizon BS. As far as the XAA-U1, I understand then.
Click to expand...
Click to collapse
Yeah, I misread..
try VZW version
https://updato.com/firmware-archive-select-model?record=12EDD7F878D311E89F15FA163EE8F90B
Or VZW U1
https://updato.com/firmware-archive-select-model?record=E2DA06D078D411E89F15FA163EE8F90B
For proper functionality, make sure there's a "userdata" file when you unzip.
Also, use CSC file which wipes the phone, not home csc file which keeps data intact.
If things don't work.. keep sim inside and do a factory reset with sim. it'll ensure proper CSC selection.

nimms said:
Yeah, I misread..
try VZW version
https://updato.com/firmware-archive-select-model?record=12EDD7F878D311E89F15FA163EE8F90B
Or VZW U1
https://updato.com/firmware-archive-select-model?record=E2DA06D078D411E89F15FA163EE8F90B
For proper functionality, make sure there's a "userdata" file when you unzip.
Also, use CSC file which wipes the phone, not home csc file which keeps data intact.
If things don't work.. keep sim inside and do a factory reset with sim. it'll ensure proper CSC selection.
Click to expand...
Click to collapse
See the issue is those links you posted are meant for the V2 bootloader. G960UOYN(2)ARF4 . I've actually tried the U1 and all from V2 but, it gives back that binary fail due to me being on the V3 bootloader. I'll try with the V3 bootloader files for verizon again and do the whole factor reset afterwards. Unfortunately there hasn't been a V3 U1 yet for the S9. Thank you for helping me figure this out, i'll post my results shortly.

nimms said:
Yeah, I misread..
try VZW version
https://updato.com/firmware-archive-select-model?record=12EDD7F878D311E89F15FA163EE8F90B
Or VZW U1
https://updato.com/firmware-archive-select-model?record=E2DA06D078D411E89F15FA163EE8F90B
For proper functionality, make sure there's a "userdata" file when you unzip.
Also, use CSC file which wipes the phone, not home csc file which keeps data intact.
If things don't work.. keep sim inside and do a factory reset with sim. it'll ensure proper CSC selection.
Click to expand...
Click to collapse
Updating from earlier, I tried with the Verizon U3ARG8 file and all it did was add on the bloatware from verizon. I've tried factory resetting and all and it still doesn't want to swap over. Every time it boots, it begins with the AT&T boot logo and proceeds to not give me proper service. I can mess with the LTE bands and get data working, just not service itself.

megaghostgamer said:
Updating from earlier, I tried with the Verizon U3ARG8 file and all it did was add on the bloatware from verizon. I've tried factory resetting and all and it still doesn't want to swap over. Every time it boots, it begins with the AT&T boot logo and proceeds to not give me proper service. I can mess with the LTE bands and get data working, just not service itself.
Click to expand...
Click to collapse
In S8, there's a method using Combination rom (factory binary) to do a proper carrier switch. Take a look and try. Not sure if that would work, but that's an option.

nimms said:
In S8, there's a method using Combination rom (factory binary) to do a proper carrier switch. Take a look and try. Not sure if that would work, but that's an option.
Click to expand...
Click to collapse
Just tried it, once you get in the factory binary, you're supposed to type *#243203855# in the dialer and be able to switch it there however, it's not allowing me to do so. All it does is clear what I've typed.

megaghostgamer said:
Just tried it, once you get in the factory binary, you're supposed to type *#243203855# in the dialer and be able to switch it there however, it's not allowing me to do so. All it does is clear what I've typed.
Click to expand...
Click to collapse
S8 needs flashing canadian CSC before flashing factory binary. Did you try that too?

nimms said:
S8 needs flashing canadian CSC before flashing factory binary. Did you try that too?
Click to expand...
Click to collapse
The Canadian csc is XAC right? Just trying to hunt for one. I don’t see any for the G960U. I see XAS (unknown) but, I don’t believe it’s the same thing.

megaghostgamer said:
The Canadian csc is XAC right? Just trying to hunt for one. I don’t see any for the G960U. I see XAS (unknown) but, I don’t believe it’s the same thing.
Click to expand...
Click to collapse
You must look for G960W files for Canadian csc

nimms said:
You must look for G960W files for Canadian csc
Click to expand...
Click to collapse
Got it, however, since it's the Canada one, it only allows me to change the CSC to companies from Canada. It doesn't allow me to type the code in factory binary but, it does in stock rom with the XAC CSC flashed. I tried the adb shell where you use the echo function but, I get the common problem others do "/system/bin/sh: can't create /efs/imei/mps_code.dat: Permission denied".
Seems though we are getting closer and closer, never seen something so stubborn haha. Sucks there isn't a U3 XAA yet.

megaghostgamer said:
Got it, however, since it's the Canada one, it only allows me to change the CSC to companies from Canada. It doesn't allow me to type the code in factory binary but, it does in stock rom with the XAC CSC flashed. I tried the adb shell where you use the echo function but, I get the common problem others do "/system/bin/sh: can't create /efs/imei/mps_code.dat: Permission denied".
Seems though we are getting closer and closer, never seen something so stubborn haha. Sucks there isn't a U3 XAA yet.
Click to expand...
Click to collapse
Flashing process
Factory binary,
Do reboot to bootloader via ADB,
Flash Canada "Home CSC" (not plain CSC)
Dial *#243203855# via IME button
Choose XAC, let it restart,
On adb shell, Type in
echo "VZW" > /efs/imei/mps_code.dat
(Make sure to include quotes on VZW)
If that's what you did, i think we are done here (Can't think of any other options)
Source : https://forum.xda-developers.com/galaxy-s8/how-to/snap-guide-flashing-standard-fw-carrier-t3625817

nimms said:
Flashing process
Factory binary,
Do reboot to bootloader via ADB,
Flash Canada "Home CSC" (not plain CSC)
Dial *#243203855# via IME button
Choose XAC, let it restart,
On adb shell, Type in
echo "VZW" > /efs/imei/mps_code.dat
(Make sure to include quotes on VZW)
If that's what you did, i think we are done here (Can't think of any other options)
Source : https://forum.xda-developers.com/galaxy-s8/how-to/snap-guide-flashing-standard-fw-carrier-t3625817
Click to expand...
Click to collapse
Meant to reply back but, after flashing the hell out of the phone, it somehow went into XAA CSC and I factory reset it and afterwards it allowed me to connect to Verizon. Thank you so much!

Hi,
Im also trying to convert a VZM S9 to a Canadian CSC. Do the above steps work? because after i flash the factory bin, boot into it, when i try to flash the home_csc from the canadian fw, it always fails, no matter which odin i try. also that IME code, is it only supposed to work once the canadian home_csc as been flashed? because if i try that code in the IME section of the factory bin, i get nothing!

S4 lte goes off just to receive calls (had same problem on S3)

Have a very weird problem, and think it is because of any app...
I use a galaxy tab s4 lte as a phone, it is a fully functional phone oversized... it is great, and im using tablets as phone 3 or 4 years ago... first was galaxy tab s2 lte, then s3, and now s4
S2 worked great... S3 worked great but from march of this year, randomly phone disconects fron network just to receive calls.... sms, 4g and wifi always work, but canr receive calls till i make a call... it is like it disconnects from network... i notice that, because i have (from the times of s2) my phone forwarding calls to my wife's phone when my phone is turned off or im in a plane for example...
But with tab s3, from march, i was in home with my wife and someone that call me ringed directly to my wife phone... as if my phone was turned off...a lot of times saw that... but when i place a call... it start receiving calls again...
Went to tmobile, changed the sim and same problem...
Bought a new S4 lte ($1000) and from the day 1 same problem...
Any help? Im pretty sure it could be any app... but dont know where to start

Factory reset, then install your apps, one at the time until it happens again. It's long process but unless someone came across it it's the only way to find out which app causes it. Perhaps not the only way. Have you tried to replicate it? Reboot your tablet, then ring it to check if it receives it. If not, you can uninstall one app, reboot, call, uninstall , repeat until you find which app it is. It's likely quicker this way but you need to be able to replicate it.

Most likely is the VoLTE is not set up right. And sounds like fallback to 3G for voice is not happening. Try locking it on to 3G and leave it in standby. Check whether inbound calls are coming through when you are camped on 3G.
It is possible to edit your CSC file to get it working properly. but you'll need to know all the correct fields to change and will require you to root, install custom recovery etc.

I haven't thought about that. Try that first. I mean locking to 3G.

Too51oll said:
Factory reset, then install your apps, one at the time until it happens again. It's long process but unless someone came across it it's the only way to find out which app causes it. Perhaps not the only way. Have you tried to replicate it? Reboot your tablet, then ring it to check if it receives it. If not, you can uninstall one app, reboot, call, uninstall , repeat until you find which app it is. It's likely quicker this way but you need to be able to replicate it.
Click to expand...
Click to collapse
I have factory reset 3 times... same problem... when reset it works just fine... for a while....

1eStar said:
Most likely is the VoLTE is not set up right. And sounds like fallback to 3G for voice is not happening. Try locking it on to 3G and leave it in standby. Check whether inbound calls are coming through when you are camped on 3G.
It is possible to edit your CSC file to get it working properly. but you'll need to know all the correct fields to change and will require you to root, install custom recovery etc.
Click to expand...
Click to collapse
Sounds good... but would hate if this was the problem, dont want to root phone... anyway... s3 was working ok till march... one year worked great! Because of that i think it can be a setting or app... there is any way yo change volte? I have seen something like that in any menu but cant find now
Seeing about volte... i remember on s2, and on s3 im not quiete sure, the hd call icon, related to volte, bit now have not that option in phone app settings
Thanks

I don't think the tabs4 t835n makes calls over lte, only 3g as per the specs on the samsung site. Mine always reverts to 3g when making voice calls. It still sounds great but this is the way it makes or receives calls.
Continuous Talk Time (3G WCDMA) (Hours)
Up to 50
That being said, it would be great to find out if it is capable and since there is root now, take the settings from the note9 and push it to the tabs4 T835n.

Have you tried if it receives calls after reboot?

Too51oll said:
Have you tried if it receives calls after reboot?
Click to expand...
Click to collapse
yes it does... it receives calls after reboot, and after placing a call

1eStar said:
Most likely is the VoLTE is not set up right. And sounds like fallback to 3G for voice is not happening. Try locking it on to 3G and leave it in standby. Check whether inbound calls are coming through when you are camped on 3G.
It is possible to edit your CSC file to get it working properly. but you'll need to know all the correct fields to change and will require you to root, install custom recovery etc.
Click to expand...
Click to collapse
Friend... switching to 3g works great... this problem is on lte... it is possible to edit or flash csc without rooting? Would be possible to edit with s9 parameters? I mean, dont know if it has 10 lines of code or 10000! Just asking
Would like to fix it without rooting

wallyhenderson said:
Friend... switching to 3g works great... this problem is on lte... it is possible to edit or flash csc without rooting? Would be possible to edit with s9 parameters? I mean, dont know if it has 10 lines of code or 10000! Just asking
Would like to fix it without rooting
Click to expand...
Click to collapse
I'm not sure it's possible without root access. You could try extracting the correct csc file for s9 and flash it via ODIN.
If you have root access you can peruse your csc file using this app:
https://play.google.com/store/apps/details?id=ma.wanam.cscexpert

1eStar said:
I'm not sure it's possible without root access. You could try extracting the correct csc file for s9 and flash it via ODIN.
If you have root access you can peruse your csc file using this app:
https://play.google.com/store/apps/details?id=ma.wanam.cscexpert
Click to expand...
Click to collapse
Thanks for your quick reply friend... you mean i could flash s9 csc without any modification? Its safe to do that? Can i backup my actual csc just in case with odin? Thanks!

1eStar said:
I'm not sure it's possible without root access. You could try extracting the correct csc file for s9 and flash it via ODIN.
If you have root access you can peruse your csc file using this app:
https://play.google.com/store/apps/details?id=ma.wanam.cscexpert
Click to expand...
Click to collapse
that in the screenshot of the app you send me is exactly what i need to turn off i think...

wallyhenderson said:
that in the screenshot of the app you send me is exactly what i need to turn off i think...
Click to expand...
Click to collapse
Maybe you can ask your carrier to disable VoLTE for your account?
You will be trying at your own risk when you try to flash alternate CSC, remember you can always flash back to original.
You could also try flashing a complete firmware from a different country, check firmware available on Sammobile, search by your model code. TAB s4

1eStar said:
Maybe you can ask your carrier to disable VoLTE for your account?
You will be trying at your own risk when you try to flash alternate CSC, remember you can always flash back to original.
You could also try flashing a complete firmware from a different country, check firmware available on Sammobile, search by your model code. TAB s4
Click to expand...
Click to collapse
3 Great ideas!... ask your carrier seem to be the best if they cooperate... flash csc is the second best because have not to reset phone.... and flashing a complete firmware from a different country is a great idea too but have to reinstall everything...
I think this was what happened with my S3... everything worked fine till i flashed a complete firmware from a different country when oreo update came...
Friend.. you help me a lot... really appreciate your help

1eStar said:
Maybe you can ask your carrier to disable VoLTE for your account?
You will be trying at your own risk when you try to flash alternate CSC, remember you can always flash back to original.
You could also try flashing a complete firmware from a different country, check firmware available on Sammobile, search by your model code. TAB s4
Click to expand...
Click to collapse
F***... there is only one firmware for the T835N (i own a T835N)on Sammobile but 3 for T835C... will download all 4 firmwares and try to figure out if i can get the CSC file form a T835C...
PD: Do you know what is the difference between T835N and T835C?
Thanks again friend

1eStar said:
Maybe you can ask your carrier to disable VoLTE for your account?
You will be trying at your own risk when you try to flash alternate CSC, remember you can always flash back to original.
You could also try flashing a complete firmware from a different country, check firmware available on Sammobile, search by your model code. TAB s4
Click to expand...
Click to collapse
One question... do i need to root before flashing CSC? or can flash it just as a complete firmware just using CSC slot?
Thanks

1eStar said:
Maybe you can ask your carrier to disable VoLTE for your account?
You will be trying at your own risk when you try to flash alternate CSC, remember you can always flash back to original.
You could also try flashing a complete firmware from a different country, check firmware available on Sammobile, search by your model code. TAB s4
Click to expand...
Click to collapse
Its me again friend... sorry for bothering you so much!
Look... here is the think...
I have downloaded two full firmwares...
the T835NKOU1ARGH_T835NKOO1ARGH_KOO for the T835N (the only firmware sammobile has for T835N)
the T835CZHU1ARH3_T835CTGY1ARH3_TGY.zip for the T835C (the latest firmware sammobile has for T835N)
When i extracted the CSC from that two firmwares i saw they are differents sizes! T835C is more than double than T835N...
Look at the picture attached...
T835N CSC File
CSC_OMC_KOO_T835NKOO1ARGH_CL13953229_QB19044239_REV00_user_low_ship_MULTI_CERT.tar.md5
47MB
T835C CSC File
CSC_OMC_TGY_T835CTGY1ARH3_CL14074605_QB19357398_REV00_user_low_ship_MULTI_CERT.tar.md5
112MB
What do you think about this? would be safe to flash a file, from other device with double the size...
It is the only thing i can do (talking about flashing other CSC) because on Sammobile there is only one complete firmware for the T835N... is not like other phones that you can choose country... the only country is korea
Thanks in advance....

wallyhenderson said:
One question... do i need to root before flashing CSC? or can flash it just as a complete firmware just using CSC slot?
Thanks
Click to expand...
Click to collapse
I believe if you flash only the HOME_CSC it will preserve your data.
You don't need root
First up though, I would strongly recommend you try to back up your data using Samsung Smartswitch (back up to SD card). And try to back up to Samsung Cloud (not sure if this still is a thing). So you can restore when things go pear shaped
I believe the chances of getting VoLTE working faultlessly on your Korean tab are pretty close to 0. But if that's what you want, I would first try flashing a known working CSC from a device with same android version on YOUR carrier (Note 9 maybe?). This is unlikely to work, I think Samsung has been encrypting CSC files recently. You may need to flash Korean firmware at this point.
Secondly, I'd try flashing an alternate csc_home package from another country. Try the one you've downloaded. If you search T835 on sammobile there are many countries listed. I'd try XSA Australia if the first one doesn't do what you want.
You're on your own my friend.
If all this is getting too hard, just leave your tab locked to 3g in it's current state.

1eStar said:
I believe the chances of getting VoLTE working faultlessly on your Korean tab are pretty close to 0.
Click to expand...
Click to collapse
I dont want to getting work VoLTE... i want to switch off buttt... not setting phone in 3G... setting it in 3G implies i will not be able to make good whatsapp video calls... skype calls... stream tv... ando... or at least nos to foas as stayong in LTE but with VoLTE turned off
1eStar said:
But if that's what you want, I would first try flashing a known working CSC from a device with same android version on YOUR carrier (Note 9 maybe?). This is unlikely to work, I think Samsung has been encrypting CSC files recently. You may need to flash Korean firmware at this point.
Click to expand...
Click to collapse
You mean that a Note 9 CSC should work? I mean is better for you i try a Note9 CSC than a T835C one?
1eStar said:
If you search T835 on sammobile there are many countries listed. I'd try XSA Australia if the first one doesn't do what you want.
Click to expand...
Click to collapse
Friend for the T835N (the phone i own) on Sammobile there are only 1 firmware... for th T835C there are 3... these two devices are LTE... but for the T835 you see a lot... but they are only wifi... do you say a wifi device from XSA australia will have CSC file? Im confused
1eStar said:
You're on your own my friend.
Click to expand...
Click to collapse
I know dont worry... really appreciate your help but dont worry i didnt blame you if anything goes wrong...
1eStar said:
If all this is getting too hard, just leave your tab locked to 3g in it's current state.
Click to expand...
Click to collapse
Would hate have a great 4G device stuck in 3G... in the last case will root it and edit the CSC with the app you send me but im not sure root is working ok because had not time to read the tutorial and will be a pain in the a** start from zero with more tha 200 apps... a lot of passwords and more than 70gb of data (i own the 256gb model)
Again friend thanks for your help is really helpfull

Newbie need help linking S9 to current country

Hi Have s9 G960F in service provide SW ver TEL/TEL/TEL - i beleive austalian telestra,
not getting any OTA updates - currently in Israel
tried google and search on forum, not found something 100% clear
Question 1 : is there any way without flashing new FW via odin to get OTA updates? (vpn, australian sim, fake location and etc...)
Question 2: if answer to question 1 is no, where to get stock Israel FW for G960F , and what is the best option for backup and restore
Thanks!

What is your current SW? According to sammobile the latest build is the BRJ6 (https://www.sammobile.com/firmwares/galaxy-s9/SM-G960F/TEL/download/G960FXXS2BRJ6/246171/) if this one matches your current SW then there's no way you can get another udpate until, I assume Telestra is an Australian carrier, they release it...

Infinitodecimal said:
What is your current SW? According to sammobile the latest build is the BRJ6 (https://www.sammobile.com/firmwares/galaxy-s9/SM-G960F/TEL/download/G960FXXS2BRJ6/246171/) if this one matches your current SW then there's no way you can get another udpate until, I assume Telestra is an Australian carrier, they release it...
Click to expand...
Click to collapse
so when Telestra will release s9 update this s9 will get it as well? even if phone in another country and have non-Telesra sim installed?

lol2k said:
so when Telestra will release s9 update this s9 will get it as well? even if phone in another country and have non-Telesra sim installed?
Click to expand...
Click to collapse
In theory yes, but if you don't and they release a newer SW, you can just flash it iva Odin, don't it won't trip a thing nor void your warranty

Infinitodecimal said:
In theory yes, but if you don't and they release a newer SW, you can just flash it iva Odin, don't it won't trip a thing nor void your warranty
Click to expand...
Click to collapse
aware of odin option , but aything that doesnt requeire backup and restore is preffered
thanks a lot guys!

lol2k said:
aware of odin option , but aything that doesnt requeire backup and restore is preffered
thanks a lot guys!
Click to expand...
Click to collapse
As long as you flash the HOME_CSC you won't lose anything...

Infinitodecimal said:
As long as you flash the HOME_CSC you won't lose anything...
Click to expand...
Click to collapse
thats amazing, didnt knew there such an option
it also saves all of the apps data?
still what are the best backup option if things goes wrong?
it may be dual sim modle, how do i check? if yes, special firmware needed?

lol2k said:
thats amazing, didnt knew there such an option
it also saves all of the apps data?
still what are the best backup option if things goes wrong?
it may be dual sim modle, how do i check? if yes, special firmware needed?
Click to expand...
Click to collapse
My best option ALWAYS is Smartswitch, either for backup or SW update, if there's a new SW, Smartswitch downloads and installs it right away

seems telstra rolled out pie update
nothing in the phone, last update june2018
any last ideas before uing odin? maybe get australian sim card?
csc g960foxm1brf7 linked to australian telstra - not really should what to install as well

Infinitodecimal said:
My best option ALWAYS is Smartswitch, either for backup or SW update, if there's a new SW, Smartswitch downloads and installs it right away
Click to expand...
Click to collapse
hi mate , still here? can you check if you can help with my last reply please?

lol2k said:
hi mate , still here? can you check if you can help with my last reply please?
Click to expand...
Click to collapse
Odin the F out of that phone, remember home_csc not the csc :good::good:

Infinitodecimal said:
Odin the F out of that phone, remember home_csc not the csc :good::good:
Click to expand...
Click to collapse
not really understood the csc part
but if i have model sm-g960f
this will fit for sure? https://www.sammobile.com/firmwares/galaxy-s9/SM-G960F/ILO/download/G960FXXU2CRLN/250936/
or anything else i should check before re flashing besides model?

lol2k said:
not really understood the csc part
but if i have model sm-g960f
this will fit for sure? https://www.sammobile.com/firmwares/galaxy-s9/SM-G960F/ILO/download/G960FXXU2CRLN/250936/
or anything else i should check before re flashing besides model?
Click to expand...
Click to collapse
First, the csc is wrong, the link you posted is for Israel, not Australia, and second, once you downloaded the file, unzip it: once it's done you'll have 5 files(as you can see in the picture): AP, BL, CP AND 2 CSC home_ (that one won't erase a thing) and the csc (this one will format your phone)

Infinitodecimal said:
First, the csc is wrong, the link you posted is for Israel, not Australia, and second, once you downloaded the file, unzip it: once it's done you'll have 5 files(as you can see in the picture): AP, BL, CP AND 2 CSC home_ (that one won't erase a thing) and the csc (this one will format your phone)
Click to expand...
Click to collapse
i want Israeli FW on this phone, is it possible?

lol2k said:
i want Israeli FW on this phone, is it possible?
Click to expand...
Click to collapse
Technically you can

hi! can somebody tell me about compatibility between s9 variants? i have an G9600 and i want to install Pie. Which variant can i flash? the 960N? 960F? 960u?
thanks a lot

Infinitodecimal said:
Technically you can
Click to expand...
Click to collapse
so just download and flash?

lol2k said:
so just download and flash?
Click to expand...
Click to collapse
yup

Flashable Baseband/Modem update

Ever since I updated my phone my signal is bad. Constantly dropping from LTE to 4G. Is it possible to flash the older modem?
Appreciate other suggestions to improve signal

Would love to be able to do this too. I completely messed up my entire modem somehow (+1 for stupidity) - only getting 'No Network' now, flashed the latest version of the software using Odin, no Knox issues on bootup etc. Took it back to the shop and got it back this morning saying 'Unauthorised rework' carried out - out of warrany, get a new phone
The modem is in the CSC file if I remember correclty, even though I reflashed that successfully, still no luck.
So I'm happy to try anything, not like I've got anything to lose!

gaplayer26 said:
Would love to be able to do this too. I completely messed up my entire modem somehow (+1 for stupidity) - only getting 'No Network' now, flashed the latest version of the software using Odin, no Knox issues on bootup etc. Took it back to the shop and got it back this morning saying 'Unauthorised rework' carried out - out of warrany, get a new phone
The modem is in the CSC file if I remember correclty, even though I reflashed that successfully, still no luck.
So I'm happy to try anything, not like I've got anything to lose!
Click to expand...
Click to collapse
tell me your A70 version if its A705FN , MN , GM , etc and your service provider, ill send you the file

BK said:
tell me your A70 version if its A705FN , MN , GM , etc and your service provider, ill send you the file
Click to expand...
Click to collapse
Thanks! - I have the SM-A705FN version, purchased in the UK (O2). Have tried reflashing (successfully) serveral times, still only get 'pig-tails' for the network

gaplayer26 said:
Thanks! - I have the SM-A705FN version, purchased in the UK (O2). Have tried reflashing (successfully) serveral times, still only get 'pig-tails' for the network
Click to expand...
Click to collapse
https://samfrew.com/download/Galaxy__A70__/uoqi/O2U/A705FNXXU3ASI2/A705FNOTF3ASI2/
here is the firmware for your carrier (O2U), it's also the september security patch update , don't let theses dumb peoples flash your device for you , they are just paid for something they don't know anything about.

BK said:
https://samfrew.com/download/Galaxy__A70__/uoqi/O2U/A705FNXXU3ASI2/A705FNOTF3ASI2/
here is the firmware for your carrier (O2U), it's also the september security patch update , don't let theses dumb peoples flash your device for you , they are just paid for something they don't know anything about.
Click to expand...
Click to collapse
Thanks, I'm just about to flash it now using ODIN - I used Samfirm as it donwloaded quicker, is that version any different? Screenshot of the current SIM status attached.
Radio not on etc.
Will update shortly....:fingers-crossed::fingers-crossed::fingers-crossed:
[UPDATE]
Insalled the software posted by @BK last night, used ODIN and flashed everything, but used the HOME_CSC in the file. Same result unfortunately.
Added some additonal screenshots, any other suggestions?
Thanks.

gaplayer26 said:
Thanks, I'm just about to flash it now using ODIN - I used Samfirm as it donwloaded quicker, is that version any different? Screenshot of the current SIM status attached.
Radio not on etc.
Will update shortly....:fingers-crossed::fingers-crossed::fingers-crossed:
[UPDATE]
Insalled the software posted by @BK last night, used ODIN and flashed everything, but used the HOME_CSC in the file. Same result unfortunately.
Added some additonal screenshots, any other suggestions?
Thanks.
Click to expand...
Click to collapse
https://samfrew.com/download/Galaxy__A70__/9fqy/O2U/A705FNXXU3ASG7/A705FNOTF3ASG5/
downgrade to this CP and CSC then , or maybe you accidentally got rid of imei? tell me if it worked.

BK said:
https://samfrew.com/download/Galaxy__A70__/9fqy/O2U/A705FNXXU3ASG7/A705FNOTF3ASG5/
downgrade to this CP and CSC then , or maybe you accidentally got rid of imei? tell me if it worked.
Click to expand...
Click to collapse
I still have both IMEI numbers.
Have just flashed the CP and CSC - A705FNXXU3ASG7/A705FNOTF3ASG5 - Nothing else. in ODIN, had to factory reset / wipe cache
Going through the default setup at the moment, but sitll I can see those little No Netowork Symbols....
Will update again shortly.,,,,

gaplayer26 said:
I still have both IMEI numbers.
Have just flashed the CP and CSC - A705FNXXU3ASG7/A705FNOTF3ASG5 - Nothing else. in ODIN, had to factory reset/wipe cache
Going through the default setup at the moment, but still, I can see those little No Netowork Symbols...
Will update again shortly.,,,,
Click to expand...
Click to collapse
[UPDATE] Still the same -
If you look at the screenshots, you can see the radio/modem is borked. The status says the radio is off. there must be a way to enable it again surely?

Sam Firmware?
gaplayer26 said:
[UPDATE] Still the same -
If you look at the screenshots, you can see the radio/modem is borked. The status says the radio is off. there must be a way to enable it again surely?
Click to expand...
Click to collapse
could somebody please tell me the software version I should use for the International A70 SM-A705MN. which is working great on T mobile in Florida. want to root, and try out some customs Thank You.