How can I unroot my device safely?

I want to bring my phone back to normal mode. Buy normal mode I mean I want to basically bring my phone back to the beginning/stock. I want to receive OTA's, every latest updates. I don't want root anymore, none of that, I want my phone back to normal/stock.

So how could I do this without messing anything up? - My Nexus 5 device is only rooted, it is not running on any ROM, it has TWRP Recovery, and that's about it.. I'm bored and tired of root and want to go back to normal.

Please help me safely root my lg g4

I am trying to root my lg g4, I began the steps of unlocking the bootloader, downloaded the adb.exe etc, however when I type adb reboot bootloader into the command prompt whilst attempting to fetch my device id, it says device not found.. id be really greatful if somebody could walk me through this process. (thanks in advance)

REDMI NOTE 3 Pro [Snapdragon] Tip to unlock bootloader Safely

Considering the struggle i had unlocking the bootloader officially (not wanting to take the risk of Bricked device)
And reading all the available guides and tips around various forums on Google, this includes mi community, mi forum, mi india forum, xiaomi eu, XDA and various other sites.
i finally figured out the easiest way based on my own research and success i got.

Its safest and easiest method but require patience.

Prerequisites.
*Working and stable internet (phone and Computer)
*Mi Suite (for correct Drivers)
*Mi Account with complete details (Name, phone number and Synced)
*Mi Unlock Tool
*Same sim card on phone as on the Account
*Same Account that got the permission to unlock.
*Find phone feature turned on
*MI Account synced with Mi servers.
*Global Developer Rom installed
*Mi official USB cable (same that came with in the Box)
*Patience

Steps

1. Apply for the unlock permission.(i got mine approved in 2 days)
2. Connect your phone in normal mode to computer and sync it on the computer.
3. Open your browser and log on to MI cloud.
4. Connect to the Mi account on the browser.
5. Now enable Developer option on the phone.
6. Remove all the security features like fingerprint, pattern, pin or anything that that you have to secure your device.
7. Enable USB Debugging, OEM unlock and "Skip Screenlock" (this you will find just above USB debugging)
8. Log in to MI unlock tool and sign in with the same account as on the phone.(The account should have permission to unlock)
9. Connect you phone on Fastboot mode (Volume down+Power)
10. When the phone is detected in the unlock tool hit unlock. (process might fail with the same error "Could not verify the device or the account is different on device")
11. Retry without disconnecting the device. (Mine got unlocked in the 2nd straight attempt using these steps.)

Note: Try to unlock the device as soon as you get the permission. You will fail but try every day once, you will succeed in a weeks time.
I got my permission the 3rd day from the day of applying and i have been trying every day. I finally succeeded on the 7th day.


I hope this guide helps most of the people stuck with locked bootloader.