Hi. After my calibration procedure i see message in DJI GO 4 somesthing like "calibrate vps sensors". When i try to do it, i cant press the button because it is not active.
After some reboots and firmware update (but i was on the latest firmware) i start procedure. but! calibration progress stoped on 90% and all. What i have to do for calibrate VPS correctly? Thanks

Close the Assistan app, shut down your computer and restart the computer, Assistan 2 and start from the beginning.

If you have the same case after restarting everything, then please make a screenshot where it stops and export the calibration log so that our engineers could locate the issue.
You can get the calibration log here for windows PC:
C:\Program Files (x86)\DJI Product\DJI Assistant 2_V1.0.4\Assistant/calibration_signal_log.txt
C:\Program Files (x86)\DJI Product\DJI Assistant 2_V1.0.4\Assistant\vision/cali_conf.txt
Besides, what is the OP for your PC and how about the assistant 2 version?

DJI Natalia Posted at 2017-2-20 00:08
If you have the same case after restarting everything, then please make a screenshot where it stops and export the calibration log so that our engineers could locate the issue.
You can get the calibration log here for windows PC:
C:\Program Files (x86)\DJI Product\DJI Assistant 2_V1.0.4\Assistant/calibration_signal_log.txt

I'm using MacOS Sierra and Assistant 2 )

For MacOS, you can find it here: Macintosh HD/Application /Assistant.app/Contents/MacOS
Thank you.

the same problem here... start calibration button is not active. dji assitant asks to reboot the aircraft... do not know what to do...

Was this issue ever resolved my assistant program also keeps asking me to reboot aircraft.