GREAT !!! This worked. Thank you so much

Im now on a rooted update 82.
I flashed the stock 77 recovery prior the OTA.
After the OTA flash was finished an the automatic reboot was sheduled i imedately pressed the "back" and "home" buttons to get into fastboot mode. From there i flashed back CWM and booted immediately into CWM recovery. In CWM i rooted it with Chainfires latest supersu.
After that i did the reboot and everything is fine
Thnx again for helping out with clearing my Google Services Framework data to get the OTA again...
Best regards,
Manuel