Can root press and hold the power button for 15 seconds and have it power off?
You have broken power key.
You have to take it to LG. They must repair it for free if you have valid warranty does not matter you are rooted and have unlocked bl. This is not a samsung galaxy s5 with knox.
If bought the phone from google playstore then you have to rma your device in the country you bought it.
If you dont have valid warranty then you have to buy a new mother board or buy a new power switch and solder it to the mother board in the place of the old power switch
Is there no way to save one file from phone memory? I need it...