I’m having the same behavior that sedwo is having. Initially I purchased and used the utility which seemed to work for the initial regular boot. I didn’t immediately remove R8911 and the problem returned on the next reboot. I again did an EFI boot and ran the script and the video problems were again resolved. I’ve actually repeated this several times over the course of a month or so. The machine had been in sleep mode for several weeks until yesterday when I came out of sleep mode then shut it down and removed R8911. I was surprised when I powered it on to have no video at all. I understand that I can bridge the R8911 pads and “redo” the procedure but I’m not sure what that will do for me. Since I’m running the script I know I didn’t miss a step. I too am running High Sierra.