OK I finally made it! See ideabit´s solution: https://www.tonymacx86.com/threads/000000-841844-appleusblegacyroot-appleusblegacyroot-init-enabling-legacy-matching-while-trying.185464/
Just had to enable the "USBInjectAll.kext" downloaded here...
I´m connecting via HDMI (no other ports on the MoBo)
Ok I tried every bootflag..
with "cpus=1 npci=0x3000" I get stuck at the point I´ve already mentioned.
Without them it hangs at:
Enabling legacy matching
Rooting via boot-uuid from /chosen: …
I´m trying to install Sierra on my Alienware Alpha 2nd Gen. It has the Intel i5-6400T processor and a GTX 960 (desktop grade) graphics card.
With bootflags "nv-disable=1 cpus=1 PCIRootUID=1 npci=0x3000 GraphicsEnabler=No" it gets stuck at:
AppleUSBXHCI: raiseOnePowerStateTo: host...
Today I´ve installed Mac OS X El Capitan on my PC and it works perfectly. But when booting it up there is no working entry for my Windows OS (I´ve installed Mac on the 1st SSD and Windows on the 2nd; Clover UEFI, not Legacy)! In fact, there are three Windows entries in Clover, but no...