Note 10+ unlocked Tmobile issues

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XanRules

Senior Member
Apr 16, 2011
53
7
Post #9 & post #28 are what you're looking for.

Sent from my [device_name] using XDA-Developers Legacy app

Later posts contradict Post #9 re data speeds, and Post #9 doesn't address my other questions regarding what works, what doesn't, and if it matters.

The SamMobile firmware download mentioned in post #28 has been corrupted every time I've downloaded it (I tried three times today) and does not include the USERDATA file as far as I can tell. SamFirm seems to be complete.
 

pcriz

Senior Member
Later posts contradict Post #9 re data speeds, and Post #9 doesn't address my other questions regarding what works, what doesn't, and if it matters.

The SamMobile firmware download mentioned in post #28 has been corrupted every time I've downloaded it (I tried three times today) and does not include the USERDATA file as far as I can tell. SamFirm seems to be complete.

Just flash the u1 firmware. You won't have RCS natively and no video calling. Everything else works.

Also there is no TMobile u1 firmware. Just u1 firmware. No userdata.
 

XanRules

Senior Member
Apr 16, 2011
53
7
Post #9 & post #28 are what you're looking for.

Sent from my [device_name] using XDA-Developers Legacy app

Just flash the u1 firmware. You won't have RCS natively and no video calling. Everything else works.

Also there is no TMobile u1 firmware. Just u1 firmware. No userdata.
Sorry, what's the difference between the N975U firmware and the N975U1 firmware? Isn't one carrier specific and one for the unlocked phones?
 

pcriz

Senior Member
Sorry, what's the difference between the N975U firmware and the N975U1 firmware? Isn't one carrier specific and one for the unlocked phones?


The short answer is it's carrier dependant. For instance Verizon uses it's own update software handler and hides Samsung cloud.

For TMobile you listed the biggest differences. You also won't have the unlock application TMobile uses so you would need to flash back to carrier branded to get that app if you wanted to sim unlock with the app. Once it's unlocked that's it. The app hides itself and you never need to worry about it again.

But yes one is built for unlocked and one is built for carrier branded. But they are interchangeable.
 

XanRules

Senior Member
Apr 16, 2011
53
7
The short answer is it's carrier dependant. For instance Verizon uses it's own update software handler and hides Samsung cloud.

For TMobile you listed the biggest differences. You also won't have the unlock application TMobile uses so you would need to flash back to carrier branded to get that app if you wanted to sim unlock with the app. Once it's unlocked that's it. The app hides itself and you never need to worry about it again.

But yes one is built for unlocked and one is built for carrier branded. But they are interchangeable.

Right, okay - I have T-Mobile, but I've purchased an unlocked phone, so I guess the very short version of my question is, is there any point in flashing the T-Mobile firmware, and if so, which is that?
 

pcriz

Senior Member
Right, okay - I have T-Mobile, but I've purchased an unlocked phone, so I guess the very short version of my question is, is there any point in flashing the T-Mobile firmware, and if so, which is that?

RCS in messages and video calling, both which you said you don't need.

So no benefit at all. I am also unlocked on TMobile.
 
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XanRules

Senior Member
Apr 16, 2011
53
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RCS in messages and video calling, both which you said you don't need.

So no benefit at all. I am also unlocked on TMobile.
Great. Yeah, I don't video call anyone except my wife and we either use Signal or Duo and I'm not holding my breath for carrier RCS at the moment. You're one of the folks who noticed quicker data speeds unlocked, right?

Thanks for the help!
 

pcriz

Senior Member
Great. Yeah, I don't video call anyone except my wife and we either use Signal or Duo and I'm not holding my breath for carrier RCS at the moment. You're one of the folks who noticed quicker data speeds unlocked, right?

Thanks for the help!

That was my observation yes. I haven't checked much on it recently because I'm on a Korean carrier since September
 
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louforgiveno

Senior Member
Jun 24, 2010
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That was my observation yes. I haven't checked much on it recently because I'm on a Korean carrier since September
I'm surprised you say that RCS and video calling and wifi calling don't work....i have a hong kong Snapdragon and all those work for me on tmobile...
Odd how its working for some and others not.
From what i understand tmobile has stopped restricting services to non branded devices

Sent from my [device_name] using XDA-Developers Legacy app
 

XanRules

Senior Member
Apr 16, 2011
53
7
Yeah, now that I think of it my unlocked Pixel 2 XL hasn't given me those kinds of problems for the past couple years.

Is there anything I need to do other than pip the SIM in and turn the phone on? I thought I read something about like... Turning it on, inserting the SIM, rebooting when prompted, some degree of hoops to jump through for best results.
 

pcriz

Senior Member
I'm surprised you say that RCS and video calling and wifi calling don't work....i have a hong kong Snapdragon and all those work for me on tmobile...
Odd how its working for some and others not.
From what i understand tmobile has stopped restricting services to non branded devices

Wifi calling works, always has

---------- Post added at 11:57 AM ---------- Previous post was at 11:54 AM ----------

Yeah, now that I think of it my unlocked Pixel 2 XL hasn't given me those kinds of problems for the past couple years.

Is there anything I need to do other than pip the SIM in and turn the phone on? I thought I read something about like... Turning it on, inserting the SIM, rebooting when prompted, some degree of hoops to jump through for best results.

I dunno if your pixel is an indicator of a recent change. My OG Pixel had none of the issues with using at least wifi calling. "RCS" at the time didn't exist for every phone (T-Mobiles implementation only supported certain devices and I don't remember Google messages ever showing a read receipt option) and I don't remember if video calling existed in Android at that point either but I had no one I could call on TMobile to test it out.
 

louforgiveno

Senior Member
Jun 24, 2010
3,767
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Yeah, now that I think of it my unlocked Pixel 2 XL hasn't given me those kinds of problems for the past couple years.

Is there anything I need to do other than pip the SIM in and turn the phone on? I thought I read something about like... Turning it on, inserting the SIM, rebooting when prompted, some degree of hoops to jump through for best results.
...not that i can remember....no special adjustments needed that i recall.
Perhaps try re-odin firmware (either one) with your active sim card inserted.

Sent from my [device_name] using XDA-Developers Legacy app
 

SW33TOOTH

Member
Nov 27, 2019
6
1
I don't understand what I'm doing wrong. Followed the guide completly and even flashed the userdata and still nothing. No splash screen showing LTE and not 4g LTE on the status bar.

Im having the same issue.. What did you do different to get it working ?? I have no T-Mobile splash screen. Im on ( N975U1UES2ASJ8 . I tried flashing the CSC file ASH4 but Odin doesn't let me .
 
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XanRules

Senior Member
Apr 16, 2011
53
7
Well, I'm about a week in to using my unlocked Note 10+ on TMo. No issues at all. Data speeds and call quality are perfectly adequate and nothing seems to be missing or otherwise amiss.
 

2015Ducatimulti

Senior Member
May 3, 2010
968
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coldwater,mi
I have had my Note 10+ unlocked version for week, and last night switch to T-mobile Prepaid and wifi calling, volte and everything works like it should, and also I`m using the Google messages app with RCS and it works perfectly fine!
 
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m0biusace

Senior Member
May 16, 2006
146
30
Im having the same issue.. What did you do different to get it working ?? I have no T-Mobile splash screen. Im on ( N975U1UES2ASJ8 . I tried flashing the CSC file ASH4 but Odin doesn't let me .

Same issue here. XAA unlocked Note 10+. Inserting tmobile sim (or sprint, or att) does not install any carrier firmware. Installing the tmobile N975USQS2ASJ8 from samfirm with the tmobile userdata does not result in any magenta splash screen/HD voice. It still says XAA/XAA/XAA too! Seems the multi-CSC is not functioning with ASJ8.
 

dottat

Retired Forum Moderator
Jan 10, 2011
7,151
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york, pa
Samsung Galaxy Note 20 Ultra
Same issue here. XAA unlocked Note 10+. Inserting tmobile sim (or sprint, or att) does not install any carrier firmware. Installing the tmobile N975USQS2ASJ8 from samfirm with the tmobile userdata does not result in any magenta splash screen/HD voice. It still says XAA/XAA/XAA too! Seems the multi-CSC is not functioning with ASJ8.
Did you factory reset before putting your sim back in?
 
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m0biusace

Senior Member
May 16, 2006
146
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Did you factory reset before putting your sim back in?

Not sure what that would achieve -- the phone should be factory reset following flashing.
In any case, I did what you described. Flashed ASJ8, went through setup, factory reset, went through setup, put tmobile sim in. No blue screen with a sim card icon where it changes csc. Still XAA/XAA/XAA.
 

dottat

Retired Forum Moderator
Jan 10, 2011
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york, pa
Samsung Galaxy Note 20 Ultra
Not sure what that would achieve -- the phone should be factory reset following flashing.
In any case, I did what you described. Flashed ASJ8, went through setup, factory reset, went through setup, put tmobile sim in. No blue screen with a sim card icon where it changes csc. Still XAA/XAA/XAA.

I'm talking about flashing this j8. U1. You won't get the carrier changes needed to the phone unless you flash that first and get the prompt to reboot. After you get that just once you can then flash the U j8.

https://www.androidfilehost.com/?fid=4349826312261647901
 
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  • 7
    Guys...
    Actually, all you need to do is to be on the U1 firmware and then use Odin to flash the TMB CSC file.
    When you do that you have the debloated benefits of the U1 firmware with all of the Carrier features.
    This will enable the T-Mobile splash screen, Video Calling, T-Mobile 4G LTE icon, and other behind the scene carrier settings.
    (but again still being on a N975U1 base firmware)

    If you flash the T-Mobile (N975U) firmware, then you have T-Mobile apps (bloat) baked into the firmware ROM.
    If you do what I just suggested you get the features enabled with ZERO bloats baked into the ROM.
    The difference in the signal that people are referring to is likely because of the CSC (Carrier Specific Code)

    Here ya go. Here is the T-Mobile SH4 CSC file. https://androidfilehost.com/?fid=6006931924117942494
    You probably need the patched version of Odin. So here is Odin v3.13.13B_Patched: https://androidfilehost.com/?fid=6006931924117942500
    4
    Easiest way is to install t-mobile firmware on unlocked version to enjoy all the benefits along with faster carrier updates https://www.sammobile.com/sams...ote-10-plus/firmware/SM-N975U/

    Sent from my SM-N975U using Tapatalk
    3
    There are still carrier/regions for unlocked versions.
    I am not 100% why but it does no harm to get a U1 firmware based on your carrier.
    Perhaps someone could explain to me why there is a VZW, TMB, and So on U1 firmware. Since I have T-Mobile I have always downloaded the TMB U1 firmware.
    XAA is just the generic, non-carrier U1. Which again is confusing even to me but my common sense tells me that if you are using a U1 firmware, might as well get the one that corresponds to your carrier. :)

    When your N975U1 is brand new, fresh out of the box, never been used. If you go through the setup without installing a SIM card. Then your CSC would be XAA/XAA/XAA. The first one indicates the current carrier, the second one is a sales code for carrier specific features, and the last one never changes. It's hardwire in to show the original version of the phone.

    Now, as soon as you insert a carrier SIM card, it detects it, provisions for that carrier, and forces a reboot, wherein it installs the features necessary for activation on that carriers network.

    In the instance of T-Mobile, it of course provisions for T-Mobiles supported bands, and adds WiFi calling and VoLTE (but no carrier bloat or apps). So then your CSC would become TMB/TMB/XAA. T-Mobile bands/T-Mobile specific features/unbranded device.

    If you then switched that SIM to an ATT SIM, it would again provision, reboot, install. And the CSC would change to ATT/ATT/XAA.

    All the XAA firmwares are identical. When you download the TMB version of U1 firmware, it just means that it pre-provisioned for TMB. No different than the regular U1 firmware and then sticking your T-Mobile SIM in it.
    3
    How did you do it tried myself many time. Still cant get the splash screen or any tmobile features

    1.Take out sim card
    2. Boot into download mode
    3. Flash U1 firmwire with all 4 files. BL, AP, CP, CSC
    4. Once it finishes it will boot up.
    5. Go back into download mode and Flash U firmwire with the TMB USR DATA. ( If you don't flash the usr data you won't get the TMobile features and the splash screen.

    Note: make sure to download the correct files
    2
    Excellent topic and thread....:good:

    I too have the Unlocked 512GB variant of the 10+ on the stock Unlocked U1 firmware. (ie... I did not flash the TM firmware)

    From my quick speedtests, I'm getting faster speeds vs my Note 9 and Note 8, both which are TM variants.

    This is just a theory, but for those that transferred their data over to the 10+, as oppose to doing a clean set up from scratch seems to be having issues?

    I always do a clean set up from scratch due to my OCD lol.... zero issues yet...

    I'll keep it on the Unlocked firmware as I'll be travelling soon so I'll compare it in different environments (areas) along side my TM 9 and 8 to know for sure...

    The App that I've been using for years that I'd recommend you guys check out is: Network Signal Info Pro (Get to Pro version if you can, it's cheap and the Dev is a really helpful guy.... definitely worth supporting him.)

    Also, with Speedtest.net app, as some of you may know it'll show if you're connected to: Multiple or Single connection .... when comparing tests, just make sure that it's consistent by making sure it is on the same server and same "single" connection for accuracy & comparison sake.

    Thanks guys for the feedback... having real world data to compare is good..... :highfive:

    Test from work officeView attachment 4809378View attachment 4809379

    Sent from my SM-N975U1 using Tapatalk

    Nice...I too am on the stock Unlocked firmware on TM and compared to my 8 and 9 my results are the same... the 10+ is faster by 30-40%.

    So you're definitively getting better speeds with the unlocked version?

    This is weird since I know someone who is complaining about slow speeds on their unlocked.

    The internals are completely the same as far as I know, right? MIMO 4x4, carrier aggregation etc... should all be fine with T-Mobile? Difference is the firmware.

    Correct, the devices themselves are all the same with the same hardware .... the differentiating factor of course being the software to unlock the appropriate features for each carrier etc...

    Wait, so unlocked phones get updates SLOWER than the carriers do?! I've always owned carrier phones until now (deal was way better for Unlocked compared to the T-Mobile variant), but I have always thought that the carrier models were updated last?

    That's not definitive yet or if at all, because some of us on the stock Unlocked U1 firmware are getting faster speeds...

    Also, newer isn't always better :) (update wise) ....

    Is the signal actually better with the T-Mo firmware?

    Not in my case along with some others....

    Guys...
    Actually, all you need to do is to be on the U1 firmware and then use Odin to flash the TMB CSC file.
    When you do that you have the debloated benefits of the U1 firmware with all of the Carrier features.
    This will enable the T-Mobile splash screen, Video Calling, T-Mobile 4G LTE icon, and other behind the scene carrier settings.
    (but again still being on a N975U1 base firmware)

    If you flash the T-Mobile (N975U) firmware, then you have T-Mobile apps (bloat) baked into the firmware ROM.
    If you do what I just suggested you get the features enabled with ZERO bloats baked into the ROM.
    The difference in the signal that people are referring to is likely because of the CSC (Carrier Specific Code)

    Here ya go. Here is the T-Mobile SH4 CSC file. https://androidfilehost.com/?fid=6006931924117942494
    You probably need the patched version of Odin. So here is Odin v3.13.13B_Patched: https://androidfilehost.com/?fid=6006931924117942500

    Don't forget to mention that doing that will break OTAs, so you'll need to manually flash updates through ODIN. Oh and, there's no real T-Mobile bloatware to speak of. A few apps you can uninstall and maybe two you can't. T-Mobile actually has pretty clean firmware on the Galaxy phones. O my thing I hate is the damn boot animation sound.

    Well said... you beat me to it brother lol... thanks for uploading the firmwares ....

    I'm going to stay put on the Unlocked Firmware for now and test more as I travel this coming week.... you know how we do lol.... Real world testing to know for sure and it's fortunate that we have multiple devices to do so....