Xperia z3 lollipop firmware not installing

Hi guys recently my Xperia z3 updated to 5. 1. 1 lollipop and rebooted it said install applications for firmware then stopped at like 87/144 and eventually the battery drained out and the phone won't charge at all sent it to Sony and they said they can't fix it any one has any idea how I can do it my self
Appreciate any help possible fixing this phone paid alot of money and I'm disappointed Sony won't fix it

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