NX1 won't update

I’ve been trying to update my NX1 console from 4.8.1240 to 4.8.1244. I’ve downloaded the update on 3 separate USB drives, but when I put them in the NX1 the file doesn’t show up. It shows the update file on any of the regular PC’s I have, but the only folders that show up on the NX1 are the previous files on the USB Drive. I even tried using the Obsidian USB Drive that came with the console. Anybody ever have this happen, and what is the solution?