I have a problem with my mavic pro that I have just purchased
I am running the latest firmware connected to a Nexus 7 2nd gen
When I switch on the RC I get a message System Warning Check App
In the dji go 4 app on the top bar I get message Sensor Calibration Error Forward Vision Sensor Calibration Required
When I try to calibrate I get message saying Failed try dji assistant
When I connect to dji assistant on Pc running windows10 calibration button will not work
I have been following various threads on this subject and made all changes as suggested but to no avail
Any help would be much appreciated

Have you removed the clear protective film fro the forward vision sensors ?
Try a different USB cable fro PC to AC ?
Have the latest Assistant 2 software ?
If your using a laptop with a screen smaller then 17"
Try different PC and larger monitor.
Hope my info works for you !

Thanks for reply yes I have done all those things. regarding computer size in assistant 2 the calibration button will not activate after showing 3 step tutorial so as my wife says size doesn't matter

Sorry I couldn't Help -----  The wife thing ? Wahahahahahahah

Check out this thread here and see if it helps.
sensor calibration
Regards,
-d.

It is on a different forum but it talks about how to get the computer to recognize and calibrate the drone.
Regards,
-d.