In the light of unbricking my 2011 MBPro due to the known dGPU failure, I am following LangLangC's (great!) response/guide in GPU problem - Boot Hangs on Grey Screen; combined with some other threads I found regarding the extra challenges that come with High Sierra.
I was able to disable SIP, so that works (checked via
csrutil status: S.I.P. status: disabled (Apple Internal)).
However when I try
/sbin/mount -uw / it responds "disk2s1: device is write locked", so impossible to
mkdir ... to start moving the kext.
Most Q's and A's I found about this issue are about getting SIP disabled, which apparently worked for me? Where is the mistake and how can it be solved?
Being in single-user-mode my command line started with
sh-3.2, now it is
localhost: root# and saying
HID: legacy shim 2. Which after Googling happens most with Hackintoshs, strange (even after resetting PRAM again). Any help or thought is appreciated.