On the top of Xhorse VVDI2 menu, there is showing ” Remaining synchronization time XX days (Between 0 and 31 day)” (See below picture)
What does it mean?
It means the VVDI2 unit is synchronized with the Xhorse factory once per month.
It is not the authorized service.
How to do?
If those days are 1-2 day, just connect VVDI2 with Internet again, the sync will auto become 31 days again, then the device can still be used without any problem.
Tech support provided by www.xhorsevvdi.com.