Andoid phone "No Command" BOOT LOOP

I woke up this morning and my Lg K7 said "software update downloaded", and asked if I wanted to install now or later. I ran it later in the afternoon. During the installation it said "error" and reboot itself back to the lg start up screen, and then to a black screen that has a green bot with the words "no command" underneath it. How do I fix this, so my phone runs normally again?