Didn't update the firmware (doesn't have knox words in the bootloader) and just rooted it for her.
At first, it worked flawlessly - quick, responsive and smooth.
Not so log ago it started to freeze without any visible reason. After an about 8-14 hours it just freeze but the time can variable.
Only long power button pressing and reboot because of this helps.
So, to summarize... occasional freezing problem. When it freezes, the screen doesn't go ON.
Anyone can suggest something ?
I want to wipe the phone and maybe reflash original rom and root it again.
What is the best way to do this ?
Thank you for helping