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sierra update 10.12.6 not working

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I tried to upgrade my successfull installation of Sierra on DELL Optiplex 7010 i3 but the installation failed and cannot boot anymore, is this a way to roll back to original Sierra without reinstalling?

many thanks for help!

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@dilog Actually you haven't posted any pictures, try to boot with -v and post a picture, so I can debug

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Oh, thank you but in the meantime I thought again and have installed High Sierra instead. It works just fine, put a camera, bluetooth, wifi, all working OK. I only have to solve a little problem when doing restart it freezes but after shutdown it comes up good! I have also Win7 on same mbr disk and I start with the installation usb but I think go over to EasyBCD to make a smoother boot. If your experienced I would appreciate very much any hints for helping me in this direction. 

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