Hi, I am able to activate the PCI DEXT and matching is also happening. When I connect/Disconnect then Driver is loading and unloading. After this I followed below wwdc2020 link: https://developer.apple.com/videos/play/wwdc2020/10210/ The very first API used in this presentation is failing. PCIDevice->Open method is failing with error: kIOReturnNotOpen (0x2cd) This I have tried to call before and after RegisterService method call. In both case this Open method call is failing. Even I tried Open method calling from Externalmethod i.e. App->UserClient->ExternalMethod->MainDriverOpenSessionToPCIDevice In all case, Open is failing. Anyone faced this error?? If someone is able to Open session to PIC Device then it please let me know what steps to follow. Thanks