Help recover files from soft bricked Stock 5.0.2

Hi all,
was updating my stock Xperia z 6603 on Android 5.0.2 to 5.1.1
The update failed and my device is soft bricked. Is there any way I can recover data from it??
Is there any way I can go from a soft bricked stock 5.0.2 to a custom ROM directly?

Obviously need to get phone up and running again ASAP so all help that can help me get there ASAP is hugely appreciated.

Thanks

Neil