The One UI 8 Android 16 software update for AT&T Galaxy S25, Galaxy S25+, Galaxy Edge, and Galaxy Ultra has finally rolling out. The update came out early this morning, including Verizon, T-Mobile, and among other carriers in United States. Noting that this is the stable One UI 8 Android 16 that we have waiting for after beta released last month. So if you owned the mentioned devices, you must check the update right now by hitting your Device Settings>About Phone>Software>Check for Updates . Here's the build number detail s: Galaxy S25 (SM-S931U) Build Number : S931USQU5BYI3Android version : B(Android 16)Release Date : 2025-09-19Security patch level : 2025-09-01 Galaxy S25+ (SM-S936U) Build Number : S936USQU5BYI3Android version : B(Android 16)Release Date : 2025-09-19Security patch level : 2025-09-01 Galaxy S25 Edge (SM-S937U) Build Number : S937USQU2BYI3Android version : B(Android 16)Release Date : 2025-09-19Security patch level : 2025-09-01 Galaxy S...
“The operating system on your device has been modified in an unauthorised way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.”
If you ever receive that error message when installing a new software update on your Galaxy S6 and Galaxy S6 Edge, don't get annoyed. It may unpleasant to those who don't have any idea of what was that error says all about. It only appears if the software update find something like 'unofficial OS and other system images' was installed in your device. It's either your Galaxy S6 was rooted, and installed with custom OS.
The update won't just let you through to install it, but it just simply warns you that your device has been modified and that where it says “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.”
It's precautionary measures from Samsung side. because if someone do install the official software update on-top of a modified and unofficial one will result into a serious problem. It could harm your Galaxy S6 or S6 Edge in no time. So the best way to prevent that before it happens on all rooted and modified Galaxy S6 and S6 Edge, is by not letting anyone else to install the update. Samsung and your carrier provider won't support your device anymore but instead they are pointing out to resolve the issue by using Smart Switch.
Smart Switch is a software application owned and developed by Samsung itself. The basic functionality of this application is to transfer, backup and restore data files on newer Android device. But it has also a capability to initialize and restore the Galaxy S6 and S6 Edge official "Android OS" firmware.
Okay I got it? Where I can download the Smart Switch?
You can grab Samsung Smart Switch at Samsung website itself, here you go -
Just make sure to download the Smart Switch that is built for PC and Mac computers, depends of what you have then grab the right one. But before using Smart Switch, let me ask you first; Are you sure that your Galaxy S6 was rooted and or modified by you personally? If yes, then you didn't got surprise though. Download it at once, then proceed to the step-by step guide below. But if ever you did not do anything nor touched you phone's Android OS such as rooting, installing a custom recovery to a modified firmware then continue reading.
If you do not have any idea and did know what kind of unauthorized way was it, and why was that dreadful error message have showed-up for some reason. Then there is one way to find it out, by checking the binary status within the device itself. This will allow you to confirm if your precious Galaxy S5 and S6 Edge was has been modified or not.
To check and confirm it, just reboot your Galaxy S6 into download mode. First, turn off the phone, then press and hold, Home, Volume down and Power keys at the same time. And you may then press the Volume up key as it ask you to continue.
Deactivate Download mode:
Press and hold Volume buttons (Up & down) , Home and Power keys at the same time for couple of seconds then released at once.
Now, once your Galaxy S6 sets in download mode screen, it;s now time to check the binary status. This photo below is my untouched Galaxy S6 Edge. it has never been rooted nor modified whatsoever. So therefore, updating to a newer software update via Over-The-Air (OTA) is easy and smooth without any hiccups.
You may noticed these lines where it says:
That is the only one thing emphasized that the device is running on official firmware and the software update can get through without that annoying warning message., “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.” keep on appearing.
Now, if you have something similar to that operating system status but yet receive the warning message. You may now consider that it might be caused by a third-party apps you have previously installed on your Galaxy S6 or either you have some files stored in your SD card causing the false flag to appear.
Alternatively, do try these things first before performing a software update again;
1. Try to uninstall some apps that you think that it could be the primary culprit of the warning message.
2. Try to perform factory data reset, in recovery mode. But first, make sure to make a full back-up of your stored data and files before doing so as it will delete all the files you have stored in the phone's memory storage.
To access the recovery mode, simply turn off the phone, then press and hold down Volume Up, Home and Power button simultaneously.
Once the Galaxy S6 is sets in recovery mode screen, simply select to perform these following task:
3. You may also remove the SD card from the device, then run and perform the software update again.
If it gets through, then it's a success story and your journey ends here. But if not read-on to the next procedure using Smart Switch as what the warning message appeared pointed out to do so.
Using Samsung’s owned app called “Smart Switch” that allows Galaxy S6 users to back up and transfer files but it also capable for restoring the Galaxy S6 official firmware. The Smart Switch is the replacement of Samsung’s “Kies” that can be use on Galaxy S6 and latest Samsung Android devices. We are going to use the Smart switch apps that can be installed on both Windows and Mac computers. Though this method will work to unroot the Samsung Galaxy S6 but sometimes it will fail as depends how your Galaxy S6 being modified. But you may try this method first, unless we still have a the second method down below.
Run Smart Switch as administrator once installed in your computer . Then simply connect your Galaxy S6. Click “Backup” icon to back up your important data first and foremost such as Contacts, Messages, Call Log, Videos, Music, Photos, Application and etc.
Click on More… option, once the backup has made. Choose “Emergency software recovery and initialization.” in the drop-down.
Select “Software Update and Initialization” tab.
Follow the on-screen instructions that ask you to proceed or cancel.
Then wait until it says Software update and Initialization are complete.
Once your Galaxy S6 reboots disconnect and disconnect the USB data cable. Then lastly restore the previously back-up files by clicking the “Restore” icon.
However, if the Smart Switch method fail, you may try to use the advanced users approach to unroot Galaxy S6 manually. The process is something similar to the above equation but it will forcefully install back the Galaxy S6 stock firmware.
If you ever receive that error message when installing a new software update on your Galaxy S6 and Galaxy S6 Edge, don't get annoyed. It may unpleasant to those who don't have any idea of what was that error says all about. It only appears if the software update find something like 'unofficial OS and other system images' was installed in your device. It's either your Galaxy S6 was rooted, and installed with custom OS.
The update won't just let you through to install it, but it just simply warns you that your device has been modified and that where it says “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.”
It's precautionary measures from Samsung side. because if someone do install the official software update on-top of a modified and unofficial one will result into a serious problem. It could harm your Galaxy S6 or S6 Edge in no time. So the best way to prevent that before it happens on all rooted and modified Galaxy S6 and S6 Edge, is by not letting anyone else to install the update. Samsung and your carrier provider won't support your device anymore but instead they are pointing out to resolve the issue by using Smart Switch.
Smart Switch is a software application owned and developed by Samsung itself. The basic functionality of this application is to transfer, backup and restore data files on newer Android device. But it has also a capability to initialize and restore the Galaxy S6 and S6 Edge official "Android OS" firmware.
You can grab Samsung Smart Switch at Samsung website itself, here you go -
Just make sure to download the Smart Switch that is built for PC and Mac computers, depends of what you have then grab the right one. But before using Smart Switch, let me ask you first; Are you sure that your Galaxy S6 was rooted and or modified by you personally? If yes, then you didn't got surprise though. Download it at once, then proceed to the step-by step guide below. But if ever you did not do anything nor touched you phone's Android OS such as rooting, installing a custom recovery to a modified firmware then continue reading.
If you do not have any idea and did know what kind of unauthorized way was it, and why was that dreadful error message have showed-up for some reason. Then there is one way to find it out, by checking the binary status within the device itself. This will allow you to confirm if your precious Galaxy S5 and S6 Edge was has been modified or not.
To check and confirm it, just reboot your Galaxy S6 into download mode. First, turn off the phone, then press and hold, Home, Volume down and Power keys at the same time. And you may then press the Volume up key as it ask you to continue.
Deactivate Download mode:
Press and hold Volume buttons (Up & down) , Home and Power keys at the same time for couple of seconds then released at once.
Now, once your Galaxy S6 sets in download mode screen, it;s now time to check the binary status. This photo below is my untouched Galaxy S6 Edge. it has never been rooted nor modified whatsoever. So therefore, updating to a newer software update via Over-The-Air (OTA) is easy and smooth without any hiccups.
You may noticed these lines where it says:
Current BINARY: Samsung official System Status: Official
That is the only one thing emphasized that the device is running on official firmware and the software update can get through without that annoying warning message., “The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Smart Switch on your computer or visit a customer service center.” keep on appearing.
Now, if you have something similar to that operating system status but yet receive the warning message. You may now consider that it might be caused by a third-party apps you have previously installed on your Galaxy S6 or either you have some files stored in your SD card causing the false flag to appear.
Alternatively, do try these things first before performing a software update again;
1. Try to uninstall some apps that you think that it could be the primary culprit of the warning message.
2. Try to perform factory data reset, in recovery mode. But first, make sure to make a full back-up of your stored data and files before doing so as it will delete all the files you have stored in the phone's memory storage.
To access the recovery mode, simply turn off the phone, then press and hold down Volume Up, Home and Power button simultaneously.
Once the Galaxy S6 is sets in recovery mode screen, simply select to perform these following task:
- Wipe data/factory reset
- Wipe cache partition
3. You may also remove the SD card from the device, then run and perform the software update again.
If it gets through, then it's a success story and your journey ends here. But if not read-on to the next procedure using Smart Switch as what the warning message appeared pointed out to do so.
Unroot Samsung Galaxy S6 and restore back to official stock firmware using Smart Switch (First Method)
Using Samsung’s owned app called “Smart Switch” that allows Galaxy S6 users to back up and transfer files but it also capable for restoring the Galaxy S6 official firmware. The Smart Switch is the replacement of Samsung’s “Kies” that can be use on Galaxy S6 and latest Samsung Android devices. We are going to use the Smart switch apps that can be installed on both Windows and Mac computers. Though this method will work to unroot the Samsung Galaxy S6 but sometimes it will fail as depends how your Galaxy S6 being modified. But you may try this method first, unless we still have a the second method down below.
Download Smart Switch
Run Smart Switch as administrator once installed in your computer . Then simply connect your Galaxy S6. Click “Backup” icon to back up your important data first and foremost such as Contacts, Messages, Call Log, Videos, Music, Photos, Application and etc.
Click on More… option, once the backup has made. Choose “Emergency software recovery and initialization.” in the drop-down.
Select “Software Update and Initialization” tab.
Follow the on-screen instructions that ask you to proceed or cancel.
Then wait until it says Software update and Initialization are complete.
Once your Galaxy S6 reboots disconnect and disconnect the USB data cable. Then lastly restore the previously back-up files by clicking the “Restore” icon.
However, if the Smart Switch method fail, you may try to use the advanced users approach to unroot Galaxy S6 manually. The process is something similar to the above equation but it will forcefully install back the Galaxy S6 stock firmware.
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