[Q] Upgrading Android on a previously region-locked device - Galaxy Note 3 Q&A, Help & Troubleshooting

I'm looking for some help upgrading my Android version on my Note 3. The problem is that my phone was previously locked to ATT and is from the US, however I purchased it on eBay about 18 months ago and use it in the UK on Virgin. The device has been unlocked and I think it's rooted - it was unlocked with a code provided by the eBay seller and should work with any network - it's at least working with Virgin instead of ATT. The phone has an ATT mark on the back.
I've been putting this off for a while now because my knowledge of messing about with Android is very limited and I'm concerned that if I upgrade to a newer version of Android (currently 4.3), that my phone may lock back to ATT and I may be unable to use it.
To summarise, I would like to upgrade to the latest version of Android with TouchWiz, without region locking creating problems. Can anyone help?
Specs:
Model: SM-N900A
Android Version: 4.3
Baseband version: N900AUCUBMJ5

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[Q] Unbranded SGS v T-Mobile (UK) Branded SGS

Obviously, there are differences with the stock rom that will come with either version. However, as I am planning to flash around a bit, this won't matter.
However I've heard that on a branded device, if I flash a different rom then accept an OTA update it will simlock my phone. Is this correct? If so, then will getting an unbranded device be better?
Thanks.
Let's also assume the T-Mobile phone is initially locked and I have to purchase a code to unlock it.
Bump - would really like to get a response on this matter.
I don't know the answer to your question, but my Galaxy is from T mobile and is unbranded and unlocked out of the box.
My SGS is from T-Mobile UK, but I can't really answer your question either.
I can say that the device is both externally and internally unbranded (I can't say about SIM locks, but I assume it has one). No splash screens, no "Web'n'Walk" Internet icon. The firmware supplied is:
PDA: I9000XXJF4
PHONE: I9000XXJF3
CSC: I9000TMUJE6
Only the CSC is custom, I'm guessing just because it comes set up with the T-Mobile APN settings etc.
What I'm interested in is whether, if I made a nandroid backup, what base ROM I'd need to return to the phone to stock.. JF3 is the only one available it seems.
I've just bought a T-Mobile UK SGS on ebay, brand new, still sealed, it was an 'unwanted upgrade'.
I can confirm there is no branding that I've found so far, and there is no sim lock (I'm using it on O2, everything working fine right out the box), I don't know if this is the same for all the SGS that T-Mobile are selling.
another one - even the box was unbranded.
No W'n'W application as I was expecting even!
Completely unlocked.

[Q] How do I know what software version my phone is running?

Hi,
I bought an Omnia 7 off ebay, it was sold as T-Mobile Sim Locked which it was as it wouldnt accept any other sim cards.
I removed the sim lock using fastgsm codes.
Its running mango but there is no t-mobile branding at all, I got some Samsung updates through Market Place but nothing ever comes through Zune and it seems everything is pretty out of date.
OS 7.10.7720.68
Firmware 2424.10.12.3
Hardware 3.15.0.4
Radio Software 2424.11.2.2
Radio Hardware 0.0.0.800
Bootloader 4.12.0.9
Chip SOC 0.36.2.0
Has anyone got any idea from the above info (or what I need to do to find out) of what version of software the phone is running as in Uk Retail/Uk T-Mobile etc.
Press ##634# to go into diagnosis app. Then press *#1234#. This gives some info about the Rom (PDA/Phone) and the region/branding (CSC). You may need to lookup the csc code online to see what it means.
Cool thanks it says:
PDA: I8700XXJL3
Phone: I8700XXKB2
CSC: I8700XEUJL3
Today it finally updated but its only updated to OS 7.10.7740.16 everything else has stayed exactly the same?
So its running retail uk, I dont need or want internet tethering however I was hoping for updates on the Radio Software is there a way to easily force the upgrade or do I need to install a different ROM? (Phone is running on an 02 sim card)

[Q] Updating an unlocked T-mobile Note 3 with latest firmware.. Is it possible?? HELP

Hey guys,
Saw a very good deal on ebay india, the seller is selling an unlocked version Note - 3 T-mobile (US), so it can work on Indian GSM carriers.
Now, if you see the description: it mentions:
"The OS Software is Unlocked to Work with all GSM SIMS.
You are not supposed to Update the OS Software as Unlock code is applied to it"
2 quick questions:
1) Can you help me understand what does the seller mean here? The device will obviously be running on JB, so i wont be able to update it to the officially released Kitkat? Will manually flashing a firmware from say Sammobile, revert the unlock code and make the device useless?
2) Buying a US phone for Indian use.. Will i miss out on any features? or will it be a problem in any way??
Please help me out guys

Update my sim unlocked Sprint Galaxy S7 to stock Nougat will lock it again?

Hi guys,
First i need to say my android knowledge is less coz i am a guy who coming to android from iOS backyard. I recently bought a Samsung galaxy S7 in Singapore. I bought it from a generic shop(not from official Samsung shop)
Unfortunately I got to know from Samsung, this phone is a sim unlock phone which is originally belongs to Sprint USA. Currently It's running Android 6.0.1 and I can use my local Singapore sim. When I check the IMEI number from the web it says the model is "Galaxy S7 G930P". But within the phone settings it says the model number is "SM-G930F".
My question is, If i manually update to stock Android 7 by using Odin tool, will the phone is lock again? Help is highly appreciated
Thanks
It shouldn't. I've done a bunch of Odin flashes since having my 930P unlocked. The only thing that's ever re-locked my phone was inserting any Sprint-based SIM card.

OTA Update Not Available Galaxy S8 Active (AT&T SM-892A)

As far as I am aware the AT&T Galaxy S8 Active is supposed to be compatible with Android 9.0 (Pie). I just bought an unlocked version of this phone on Amazon and it is currently on Android 8.0 (Oreo). This is the baseband version: G892AUCS3BRG1. I have tried flashing the update file from this post, but I kept getting a PIT error. I also tried using Samsung's Smart Switch, but that also says that 8.0 is 'up to date'. I don't plan on getting an AT&T sim and the phone currently has no sim. Now that you know the information here is my question: How can I update to 9.0 without getting an AT&T sim? The best solution would be a working 9.0 Flash for my device. Thanks to anyone who figures anything out.

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