I am using an Microsoft Lumia 830 for work. Every time I try to get the “Microsoft Update for Windows Phone-Windows 10 Mobile 10.0.14393.1066, the phone downloads the update, but cannot install it.
I received error code 0x80310000.
How to fix this error (0x80310000):
Turn off your device encryption if you have it turned on. It helped for me, make sure you reboot your device after deactivating device encryption.
It seems that when the update is going to be installed (gears screen/bootloader) it can’t read encrypted data.