Read the statement by Michael Teeuw here.
MM not starting after update
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@dicker182 also need npm install
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@sdetweil thats it. Thank you!
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npm install helped me also. Thank you!
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@jani-karna thanks, can u tell me where u got the update instructions?
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@sdetweil
from here:https://github.com/MichMich/MagicMirror#updating-you-magicmirrorand followed the instructions in “updating”-section. I first did the “test” update and then after no problems used the “apply” as instructed there.
It didn’t mention “npm install” there. - 
@jani-karna ok, the script WOULD have done the update, but it failed…
can u send me the MagicMirror/installers/upgrade.log?
same id as here on gmail…
thanks
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@sdetweil should be on its way now.
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@sdetweil is there any easy way of backing up any modified files, configs or .css files. The upgrade messed up a lot and even when I thought I had everything backed up as files there were a lot of changes I had to manually fix afterwards.
The upgrade process mentioned custom.css to be saved and restored after but it didn’t.
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@jani-karna hm… there is only one file saved/restored, cause all the other files aren’t touched…
were u on 2.9 before? the log says 2.10, so there was a git put or something before
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@sdetweil no that I remember, I actually used instruction from this forum before and used “git pull” in MagicMirror directory first. After that I found the instructions I told you in the earlier post when my MM wouldn’t start. Then I tried that and when it still didn’t start I posted here.
 
