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Rooting, OS downgrades, Knox, and backup software questions

Hi everyone, I'm purchasing an S6 next week and I have a few questions. I'm not a Android expert, so excuse my ignorance on some of these questions. I have been a Blackberry user for over 10 years and have a samsung tablet I sometimes use so I know enough to get by.
1. From what I have read there is a Samsung Knox which is a counter that will detect if the phone is rooted and it can possibly void the warranty. I have Att and I hate bloatware on my phones, so based on a previous post i made, it appears the only way to remove these apps is by rooting. Is there a way to flash a custom rom without tripping this counter or is it too soon to tell?
2. Lets say I keep the factory OS that came with the phone and I upgrade the OS, OTA when Samsung/ATT releases the next version of android in the future, is it possible to downgrade to the older version (or current lolipop) without tripping Knox and voiding any warranty or as soon as the phone is flashed with a new OS it is not under warranty anymore?
3. If i understand correctly Knox keeps track of how many times the phone has been flashed and if it has been rooted? If the phone is flashed with an older version of android released by Samsung/ATT is it still going to keep track of this or only when it is flashed with a custom rom?
4. Lastly what is the best backup software for backing up app data? I believe I had downloaded Keiss for my tablet but that is not compatible with S6 so Smart Switch and Helium I have read are the best options unless there are others you guys recommend.
Cheers

Error ,,The operating system on your device has been modified in an unauthorised way.

I root my Samsung Galaxy Grand Prime and when i want
to update it say'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,, i have searched for tutorials on Youtube i have searched every page but nothing there's nothing. Please help. By the way thank you.

Once you root your device, you void the warranty and any contracts to get new software updates, however your actual apps will still update. This is why in many tutorials it is mentioned to backup the stock ROM before rooting.
Using CM12.1 on my SGH-T999

After flashing stock firmware Samsung Health says I'm rooted when I'm not

I've checked on my download mode screen and Knox isn't tripped and my device status is official.
However, today, after installing official Samsung software, Samsung health claims it can't run on a rooted device, which mine isn't. I have tried reinstalling it and factory resetting. I've tried installing the PHE firmware which it supposedly came with, but to no avail. What can I do?
Also, what is a foolproof way to know which specific firmware my phone came with?
Thank you.

Any way to get software updates when you root Samsung?

Hi,
I've stock software installed Samsung Galaxy S9 with root. When I try to check updates, It says "The operating system on your device has been modified in an unauthorised way".
Is there any possibility to bypass that error and get updates?
Regards.

Samsung doesn' like it when you tamper the pre-installed Android OS, and that for good reasons: as soon as Android is got rooted the door is wide open for every hacker / malicious software and Samsung understandably doesn't want to have to take responsibility for damages that result from it.

xXx yYy said:
Samsung doesn' like it when you tamper the pre-installed Android OS, and that for good reasons: as soon as Android is got rooted the door is wide open for every hacker / malicious software and Samsung understandably doesn't want to have to take responsibility for damages that result from it.
Click to expand...
Click to collapse
Are you saying that there is no way to bypass it? I've read some topics like fake system status etc. but I'm not sure if they are still working.

Question Return to Stock?

Good Morning Everyone
As the title suggests, i am looking to return my S22 Ultra back to stock.
i was on beyond rom for a bit, but too many apps complaining that my device was rooted has forced my hand to return my device back to stock once again.
I flashed the stock rom via odin, then locked my bootloader and wiped all data.
However i am still getting messages that my device is modifed.
Anyone got any ideas how to can truely return to full stock?
Thanks in advanced.
And yes i did do a search on the internet before asking, but i have been unable to find any advice outside of what i have already done.

happend to me, too. But only on the latest firmware. When I flash an older firmware, it won't appear. But after updating again to the latest ROM the message appears

Cheers mate. I'll give that a go.

Also note that if the device was rooted then you triggered the Knox flag and that one CANNOT BE RESET, it's an "efuse" (a hardware component that once changed it's state can only be reset by replacing it, i believe you need to replace the entire motherboard for that).
So, if the application checks the Knox status it will fail.
Here are a few apps that i know that will not work anymore :
- Knox itself (and any app that uses the Knox library/API )
- Samsung Pay
- Samsung Health
- Secure Folder
A few years ago I also had a banking app that failed to worked with a Knox flag triggered (on a Note 8), but after an update it allowed me to use the phone as long as i didn't have it rooted.