Provide instructions to users when firmware install fails

> Sorry guys, missed this - probably easiest to ping me on Slack if something needs a review, because the emails get buried sometimes.
>
> Definitely seems to be an improvement over the current system - nice work! :-)
>
> I'm ok with this being merged as is, although in my ideal world
> - it would provide the actual error message from the uploader when it fails (as discussed in #840)
> - there would be some notice when the uploader fails that the user will most likely need to reboot the vehicle before they're able to try to upload firmware again
>
> It's possible both of those points are planned to be handled in separate PRs.

_Originally posted by @ES-Alexander in https://github.com/bluerobotics/BlueOS-docker/pull/1022#pullrequestreview-993400293_