Macbook pro 15′ 2011 gpu fix disable

This worked for me: boot using Command + s manually type nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00 and run it manually type nvram boot-args=”-v” and run it reboot boot using Command + r (this time it boots fine, no grey screen) disable SIP: manually type csrutil disable and run it manually type nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00 and READ MORE