Downgrading from 10.13 back to 10.12


so got tired of high sierra, want clean install sierra onto 2017 macbook pro. problem is, created sierra boot drive trying boot makes go prohibitory sign. usb boot drive works fine on old 2011 macbook pro... doesn't on laptop reason. there way fix that? command + r goes high sierra recovery , clean install 10.13...
 

restore time machine backup.
 


Forums Macs macOS macOS High Sierra (10.13)


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