I need to unroot my samsung tablet .

[Victor Villalobos]

My little brother tried to root my samsung tab a tablet and failed. Then he turned KNOX on and now it won't turn on what can I do to fix this? please help me.

 

[Beut]

What is your model, SM-T350 or SM-T550 ?
Is your tablet able to enter Download Mode ( Power+ Volume Down + Home ) ?
If you can do so, just re-flash the stock firmware by Odin.
The ROM you can download from sammobile.com, and I will help you with the bootloader which you might alter it by rooting.
Flash back the official bootloader and ROM will restore it to official state but not the KNOX count.

 

[kidcrazie]

My little brother tried to root my samsung tab a tablet and failed. Then he turned KNOX on and now it won't turn on what can I do to fix this? please help me.

Have you tried or attempted this yet?

 

[dfilteau]

Great advice, Beut. A bit late but I'm downloading from sammobile.com now.

Still around if I have some questions?