Xperia Z Stuck on a Repair Icon

[studioshash]

Hi,

I recently updated my phone with the latest update, it was working fine. Their was a marginal improvement in the battery backup etc. but after charging it today, i noticed the standby time being shown as only 10 hours in Stamina mode. I chose to reboot, and since then my phone is stuck at a repair kind of icon with z moving status bar. I can't find any reference to such incident online. please help how to fix.

[eei]

Repair on Mac wont work. Really frustrating.