EFI for X1C7 using OpenCore 0.9.9 with latest kexts available at time of release. This EFI folder should work with macOS Monterey and Ventura. MinKernel & MaxKernel values have been used to load the proper kexts for each OS.
This EFI has not been tested with Big Sur or Sonoma. It will need WiFi and Bluetooth kexts changed for it to work properly.