Or wait for v3.18 it is due out from Sony in a few days, maybe that will fix the problem.
I guess you try even the older update, via the option #6 from the "system update" in the recovery menu.
When does it fail and give you this error message?
During the first stage, checking the update?
During the second stage, preparing the update?
Or during the last stage, installing the update, after it reboots when it completed first/second stages?
It is always displayed at the same percent? 86% 60% ?