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Here is my working EFI OC097 for Latitude 5490 (i5-8350U, Intel Wifi), for Sonoma. Due to file uploading size limitation, AirportItlwm.kext (V1.23 Alpha for Sonoma) is not included. Both HDMI port and Display Port via USB-C port are working. You may give it a try. This EFI was based on this GitHub repository: juanpy0223/Dell-Latitude-5490-8th-gen. My bios is still 1.26 and did not update to the latest (V1.32) since the latest BIOS may prevent the CFG LOCK changing. Also once updated, it can not go back to earlier BIOS. I experienced this with my Latitude 5400. If you are able to disable CFG LOCK with 1.32 BIOS and set DVMT to 64MB (instruction is in the link above), then you can make the following changes to the Config.plist: - Root->Kernel->AppleCpuPmCfgLock = FALSE (for native CPU power management) - Remove the following two properties from your iGPU's DeviceProperties (PciRoot(0x0)/Pci(0x2,0x0) for my case): framebuffer-fbmem framebuffer-stolenmem Goodluck! DELL-5490-OC097.zip

'found an old Realtek RTL8139D PCI card whist clearing out old computer stuff. It's an ancient Connectland CR-CNL-FAST-R model dating back to 2008/2009... http://www.connectland.eu/products/fiche/category_id/133/culture/en/id/167/name/10-100-mbps-fast-ethernet-pci-card Gave it a shot in my old Vostro200 running High Sierra and Mojave. Installed the old IONetworkingFamily fat-binary kext from osx86.net and the card still works under macOS! First drivers for this card were released for OS X 10.1/10.2! IONetworkingFamily.kext.zip Note that the card is not supported by Mieze's RTL810x FastEthernet driver. Initially, I only installed the RTL8139 kext in /L/E and that brought the card to life but no traffic passed. The card only fully worked once I actually installed the entire IONetworkingFamily kext in /L/E, without touching the vanilla equivalent in /S/L/E. There must have been some dependancies... After the usual permissions repair + cache rebuild + reboot, the card was 100% functional. There goes an old 32bit PCI (not PCIe) card in macOS High Sierra and Mojave! Must work in all previous versions from Snow Leopard to Sierra too. vostro200:~ admin$ lspci -nn [...] 00:19.0 Ethernet controller [0200]: Intel Corporation 82562V-2 10/100 Network Connection [8086:10c0] (rev 02) [...] 04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet Adapter [10ec:8139] (rev 10) Edit: 17 Jan 2021 osx86.net now dead. Old link to file was: https://osx86.net/files/file/3172-realtek-rtl8139/