Hi @ndothi
You should try following solutions:
* Remove SD Card - if it’s installed - press volume down and power button for over 10second - your device will be restarted - Then you can try install update again
If the problem still ocures:
* Restart your device to the recover mode and wipe cache partition of device - Then try update again
If still ocures:
* Turn back your device using Factory reset
You can also try to install update in safe mode.
Regards