There are the steps I followed to fix the issue of Omnisphere showing a blank Challenge Code field: 1. Using Clover Configurator, mount the system's EFI partition under Tools > Mount EFI 2. Go to Finder -> EFI -> CLOVER -> edit config.plist with any text editor, search for "<key>Boot</key>": in the "string" field of its arguments EthernetBuiltIn=yes should be added, i.e. something like <key>Arguments</key> <string>dart=0 EthernetBuiltIn=yes</string> then save and close. 2. Alternatively, open EFI/CLOVER/config.plist with Clover Configurator. In the Boot section a new boot key-value pair needs to be added: 3. Right-click the list of boot arguments to add any of the boot arguments presented by the context menu 4. Edit the newly inserted entry by double-clicking it. It should say EthernetBuiltIn=yes 5. Remove the file /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist 6. In System Preferences > Network, remove the PAN Bluetooth (if any) connection type 7. Reboot. The NetworkInterfaces.plist file will be re-created with the "correct" ordering (Ethernet should be interface en0) 8. Internet won't probably work. Go to System Preferences > Network, remove the Ethernet connection and re-create it via the "+" button.