Let's try some other commands:
sudo chmod -R 755 /Library/Extensions/ATTOExpressSASHBA.kext
sudo chown -R root:wheel /Library/Extensions/ATTOExpressSASHBA.kext
sudo spctl --master-disable
sudo codesign --force --deep --sign - /Library/Extensions/ATTOCelerityFC.kext
sudo codesign --force --deep --sign - /Library/Extensions/ATTOExpressPCI4.kext
sudo codesign --force --deep --sign - /Library/Extensions/ATTOExpressSASHBA.kext
sudo codesign --force --deep --sign - /Library/Extensions/ATTOExpressSASHBA2.kext
sudo codesign --force --deep --sign - /Library/Extensions/ATTOExpressSASHBA3.kext
sudo codesign --force --deep --sign - /Library/Extensions/ATTOExpressSASRAID.kext
sudo codesign --force --deep --sign - /Library/Extensions/ATTOExpressSASRAID2.kext
Disable sip booting in Recovery and typing into terminal:
csrutil disable
Reboot and try again! AMD works beautifully with ATTO cards