@CaseySJ Thank you so much for the detailed instruction. It is super helpful. I was able to get my mod working (on OC0.8.2) but I am having problem getting my builtin Thunderbolt working. I have tried the RIDGE-RP05-V2.aml or download the compiled aml file from Hackindrom ("Gigabyte GC-Titan Ridge - Z690 Platform"). And tried just about all the Thunderbolt related SSDT files I can find here, but none of them worked. It seems that the ACPI path is either "RP05" or "PR21". Gigabyte Z690 AERO D has builtin Thunderbolt 4. I am not sure if the problem is due to wrong ACPI path since most people here are using PCI thunderbolt card. Attached is my EFI, if anyone could kindly give me some pointer, that will be great. Thanks so much!