MacPro 3,1 & High Sierra install

High. MacPro 3,1 with original video card. Win 10 regularly running from internal ssd partition. I created a High Sierra installer via Terminal and patched it with latest OCLP on a 500gb usb hdd (hfs+). Whenever the hdd is connecting to the MacPro 3,1 either with the front or rear USBs the HS installer partition is not available for boot. What am I doing wrong? Tnx

submitted by /u/Majortom_67
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