Thanks to OpenCore Legacy Patcher, i have upgraded my MBP 4,1 from Catalina to Big Sur. Performance is much greater compared to Catalina. But at the same time, this upgrade bringed a confusing question to my mind. To my knowledge, my machine is using an Intel ICH8-M AHCI SATA Controller which is capable of SATA II theoretically. And next generation of my machines actually used the same controller and were upgraded to SATA II capabilities with an EFI Firmware Update released by Apple. So my question is, can we upgrade to SATA II in MBP 4,1 using the kext of SATA II Controller for MBP 5,1? I remember specially creating the EFI for the OpenCore when I was Hackintoshing, so I think this could be possible and would be an major upgrade.