MacBookPro8,2 late 2011 GPU fix with EFI: how to do it on Catalina macOS 10.15 (dosdude1 patch)? This guide https://apple.stackexchange.com/a/295805/156133 is working fine on High Sierra. On Catalina installed with dosdude1 patcher (http://dosdude1.com/catalina/) I couldn't make it through, especially the thermal improvement.

I couldn't reload the AMDRadeonX3000.kext with sudo kextload /System/Library/Extensions-off/AMDRadeonX3000.kext
. I've got this error:

/System/Library/Extensions-off/AMDRadeonX3000.kext failed to load - (libkern/kext) link error; check the system/kernel logs for errors or try kextutil(8).

I couldn't either create the sudo nano /force-iGPU-boot.sh, the permission being write only.

Does anyone have a solution how to run a broken GPU late 2011 on Catalina?
I'm having the same issue trying to load the AMDRadeonX3000.kext after boot.

I was able to create the force-iGPU-boot script though, by mounting the Catalina system disk as R/W in terminal:

sudo mount -uw /