After reboot twice, i open Command Prompt with run as administrator, then run DISM /Online /Cleanup-Image /RestoreHealth to repair all possible Windows system file, follow by sfc /scannow
After that I reboot my HP Elite X2 G4. Now it seems everything is back to normal.
This is to confirm thT HP Elite X2 G4 can be updated to May 2020 version without serius problem
Hope this information help