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You're following an old thread. Remove brcmfx-driver=1 and add to properties pci-aspm-default = 0 See here for more details. https://osxlatitude.com/forums/topic/11322-broadcom-bcm4350-cards-under-high-sierramojavecatalina/?do=findComment&comment=89830

DW1510 is now an old dual-band 802.a/b/g/n half mini-PCIe. It was last natively supported in Mojave 10.14 and dropped in Catalina with which it's only supported with those specific actions described in out wireless cards inventory thread where you'll also find references of better 802.11ac half mini-PCIe cards based on BCM4352 or BCM4360 chipsets. Those are also available at very reasonable cost. If Wikidevi died a few months ago, you can still look up specifications of wireless cards on alternative wikis if you Google a little... http://en.techinfodepot.shoutwiki.com/wiki/Dell_Wireless_1510_(DW1510) DW1510 is stated at 300Mbps card, i.e. most people will only get it to operate at 150Mbps max in any given direction, not at 300Mbps per sé. In practice, that means real-life rates around 100-120Mbps on 5GHz networks and around 70-100Mbps on 2.4GHz depending on surrounding environment. Here's what I get out of my own DW1510 card on a 5GHz and a 2.4GHz network at approximately 10m from my Box (300Mbps Internet access). In comparison, I get 300Mbps both ways out of my Apple 802.11ac BCM94360CD in my Latitude E6230. Generally speaking (and that should go without saying), wireless cards are of course compatible with any PC, laptop or desktop, unless computer BIOS applies a whitelist (eg: some HP or Lenovo laptops). Rest assured DW1510 is available for peanuts for a reason: it's old and, today, somehow limited performance-wise, though still entirely suitable to many people...

Dears Jake Lo, Herve, and Magnitu I successfully install macos catalina beta-5 and beta-9 on my Dell latitude E6440 i5 4300m, Intel HD 4600, Atheros AR5B93 wifi, audio, Everything worked perfectly. I Attached my Laptop pics

Hi Friends Install macOS Catalina on Dell Latitude E6440. Install with my uploaded EFI.zip. if problem with USB Ports, Block GenericUSBXHCI.kext in Clover. USBInjectall.kext and USBinjecter.kext not worked for me. SSDT.aml is Already Present in ACPI Patched Folder for Solved the USB ports Problem in macOS Catalina 10.15 Beta. I updated my Bios version to A-23 I Attached my EFI.zip and After install.zip Folders. and Pics Also. EFI.zip After Install.zip