Read the statement by Michael Teeuw here.
NPM run start cannot be used
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 @sdetweil I don’t know how to open the developer window. 
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 @史新瑞 I just told you how 
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 @sdetweil I pressed ctrl-shift-i, but the raspberry pie didn’t respond 
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 @史新瑞 on the pi keyboard, right? all keys at once 
 with MagicMirror on the screen
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 I am going to sleep now,sorry, long day. 
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 It seems like electron and node.js version issue. 
 As far as I know, recent MM is depending on newer node and electron, but during update, your electron and node’s version is not matched properly.
 I recommend you to reinstall your nodejs and electron cleanly.
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 @sdetweil Sorry, I am not convenient for debugging today. Please allow me to come back to you for consultation in a few days 
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 @MMRIZE Thank you very much. I will try it, but I need to start it in a few days because of me. Thank you for your guidance 
