By default, the bootloader HTC S420 is locked on the phone. This is done so that the novice user does not make a fatal error while editing the device kernel and does not turn the phone into a brick.
Advantages of Rooting your HTC S420
Installation of modified firmware for smartphones on Windows Phone.
You can unlock the bootloader and then enable Root Access
Ability to modify system files
You will be able to install custom firmware on your device.
Disadvantages of Rooting your HTC S420
Your phone warranty turns void.
Be unavailable to update
Risk of 'bricking' a phone.
Rooting the phone sometimes comes viruses in the phone.
How to root HTC S420 with Computer (via Windows Phone Internals)
Before starting the rooting process, follow these steps.
1. Backup Your Device.
2. Make sure your battery is charged to 90%.
3. Just to be safe, reboot your device.
