Interesting.

I know it might sound weird but take the jetpack outside the building and attempt the master reset again. You should have a better signal strength outside the building and then the jetpack needs to connect with the network authorize the connection and then process the update if the signal strength is too weak it will be unable to do that properly.

If it still shows a bad signal then you will need to take it into a store all VZW stores have great coverage and if the device is still not functioning properly and has a poor signal in a great coverage location a CLNR (certified like new replacement) device or a warranty replacement would then be in order.

Stores should be open tomorrow.