Read the statement by Michael Teeuw here.
new update/upgrade script, ready for testing
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 @sdetweil unfortunately I can’t. in the morning, raspberry did not turn on 
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 @sdetweil a month ago when I installed the mirror according to your script, everything worked right away. but did not start yesterday. 
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 @bobwilliams Ok. Send me the log if u get a chance. Thx 
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 @sdetweil I did run this the other day when I was having an issue with node_helper not found. It didn’t fix that, but another message you posted did. The upgrade worked fine, but may be worth adding that git checkout of the node_helper index file to the script as a quick fix. 
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 @buzzkc Good idea. I can check if the file is present and restore it if not 
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 @sdetweil a few days ago I copied the image from a flash drive, now I restored it and everything repeats, again these files that he asks to save or not … if you say yes, the update does not work, if you say no then the mirror stops working 
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 @bobwilliams i need to see the MagicMirror/installers/upgrade.log… and also, open the developers window (ctrl-shift-i) and select the tab labebed ‘console’ and scroll up to find any errors… also the pm2.log 
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 @sdetweil ok try to do tomorrow, today was a hard day very tired 
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 @sdetweil Everything has appeared to be simpler than we thought. I moved the files which were the obstacle on the way of working of your script to another folder, then updated the mirror using your script. After that I moved those files back and now mirror is working. 
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 @bobwilliams What files? My script should handle it. So I want to understand. 

