Hey guys I have a problem after flashing the "T550/555 Deodexed, rooted, debloated, deknoxed, Xposed" Rom to my tab a t555 9.7 from this thread: galaxy-tab-a.boards.net/thread/8/deodexed-rooted-debloated-deknoxed-xposed
Now none of the google services are working because something like the security certificate is not valid yet (70 days in the future), so everytime google is trying to create a secure connection it fails.

Does anyone else have this Problem?

How can I fix it?

If this Problem is related to missing Knox, how can i reinstall it properly (without losing all my personal data?)

Thanks in advance

Btw I don't speak english very well, so if you have questions feel free to ask me