I have a Lumia 920 and signed in to the insider program. I installed the Windows Preview App, selected "Slow Ring", headed to "update" and saw that I have an update available. I clicked 'download' and after this finished, I clicked 'install'.
Then the phone restarted, I saw the gears, and after 3 minutes or so, it restartet again, and bootet to the normal WP8.1 screen, having an open message box saying "Could not install update. Error code 080070020".
I already googled and set the date time to manual. I also have 11GB free disk space. I already tried the install about 5 times, to no avail...
I have no idea what to do. Any help appreciated.