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Charge the phone for 1 hour,retry the update.
Does not matter,just charge for 1 hour,make sure the phone is turned off,try to repair with SUS:
http://www.sonymobile.com/gb/tools/update-service/
Hi Merohit94,
Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
If none of the instructions here help you, I suggest that you contact Sony Mobile Customer Care. They will be able to supply clear instructions on what you can do next.
I hope the above instructions help.