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Android 5.1 Lollipop update stuck

I got a notification for Android 5.1 Lollipop update for my phone. I downloaded the update but it is stuck in installing phase for more than 12 hours now! I have tried restarting the phone but after the restart, the phone automatically starts the system update again and is still stuck. What can I do?
The best answer: Try performing a system repair using PC Companion as this will often fix issues - This will factory reset your phone and erase all data
Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process
If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP