H520E RTK update problem

[polskipilot]

1.I am trying to update the H520E RTK drone software I am following the update procedure. Then I get the message "Installation blocked - For security reasons the tablet is set to block installation from unknown sources".
I deselected unknown sources in the settings, but after a reboot the DATA PILOT and only its update is blocked from the start (without a reboot also).
At the same time it is not possible to control the camera because despite the reconnection (of the drone with the camera) the control still does not work (there is an image and the drone flies normally).
What should be done in this case? (I attach a photo).
2. the current position is not displayed on the map.

 

[WTFDproject]

...
but after a reboot the DATA PILOT and only its update is blocked from the start (without a reboot also)....

Your screenshot shows the controller battery at 48%. The controller should be at a minimum of 50% to initiate an update. I don't think the update is actually blocked until 40%, but it would not be a problem to charge the controller anyway.
The file in this link is Version 2.2.53. You can copy it to your ST16E and try to install it manually.
datapilot.apk

Were you having the camera control problems before the attempted update?