Firs of all I had a problem with one device some time ago I used downloader program.
So I'll give you the same advice, just use some downloader(Free Download Manager, Orbit Download Manager, built in browser downloader, DownThemAll, Chrono Download Manager) or specific program (teracopy, totalcmd, ultracopier) to copy a firmware file onto it when it stops reconnect and resume.
I'm not sure reinstalling firmware will help and won't crash anything but if you'll need to copy something onto you can do it.
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