This error is common known on Lumia 920 after you signed up for Insider program and download the update.

How to fix Error 8018830f issue on Windows 10 for phones
How to fix Error 8018830f issue on Windows 10 for phones
To fix the issue reboot the device, try clearing the temporary files and offline maps stored in the Phone Memory and try installing the updates. Do let us know via the comment section below if the issue persists, we will be glad to assist you.