Ok so I've just set up my Xbox One tonight and as I was downloading the update it got to 100% but than it threw up an error message saying E100 and some other random numbers and that I should contact Microsoft Support. I shat my pants at that stage and thought it was bricked but I restarted my console and the error message didn't come up again and I continued my way through the setup.
Seems to be working fine right now and I'm installing Killer instinct as I type. I did a quick search on Google and it seems the update is bricking some peoples consoles (and they have to send it back to MS) for others after a restart the problem fixes itself. I guess I'm one of the lucky ones.
Has this error code happened to anyone else?