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Hi everyone, I successfully installed Big Sur beta 4 on my Latitude E 7450 using OpenCore 0.6.0. The machine is already running Catalina 10.15.6 based on Jake Lo's guide, so I will not repeat the same story (especially for specs). I only underline that this is the iGPU only model (no dGPU to be disabled here). Working: - keyboard, trackpad and trackstick (only with ApplePS2Controller provided in Jake Lo's packages. Latest VoodooPS2Controller will not be useful for this ALPS touchpad) - Wifi (thanks to Jake Lo patch) using a Dell DW1560 (as per signature) - Graphic card acceleration - Screen backlight - Bluetooth - Audio - SD card reader Not working - Bluetooth (and webcam) - Audio - Fingerprint sensor (of course, as always) - SD card reader Not tested - SD card reader (supposed not working) Hackintool (and IORegistry, of course) is able to recognize both audio and EH01 usb controller, but they seems to be "inactive" and I don't know how to fix them. Fortunately, USB3 is working, otherwise I couldn't install macOS since I used an external WD HD on a USB3 caddy. In any case, I share my EFI for development and further testing, especially for @Jake Lo. Credits: Jake Lo (and all the guys and teams who inspired him for his original clover guide) EDIT: Bluetooth, webcam and Audio work fixing IRQ issues by adding SSDT-HPET (and related patches) to ACPI. SSDT-PLUG is actually useless (you can even turn it off from the config.plist). I updated the EFI folder. EDIT 2: Properly injected device properties made the SD card reader working again. Thanks Jake! I uploaded the working EFI Updates: Big Sur Beta 5 (20A5354i) installed through software updates Big Sur Beta 6 (20A5364e) installed through software updates Big Sur Beta 7 (20A5374g) installed through software updates Big Sur Beta 9 (20A5384c) installed through software updates Enjoy! E7450-OC060-BSb-EDIT2.zip

Give this a try, updated all the kext, added a couple of SSDT's and updated the Config. You'll need to fix your USBPortsE5x70.kext. The purpose of the kexts is to have only 15 ports or less as required by latest MacOS. Your kext has 21, way over the limit and I doubt it has that many USB ports on that system. I only see internal and USB 3.0 and none USB 2.0 on your kext. You should be testing each external USB ports with an USB 3.0 and USB 2.0 devices, changing the default setting in Hackintool. For example, if you have 3 external USB ports, you should end up with (3) USB 3.0 ports (SSxx) and (3) USB 2.0 ports (HSxx) and a few internals like BT, Webcam, and SmartCard if it exists. E5470_Update.zip

It's been reported that Mojave's Security Update 2020-005 causes performance issues due to unexpected memory usage. After installation of the update, a very significant quantity of RAM is used as reported in Activity Monitor app where App Memory/Wired Memory/Compressed are at much higher level than before the update. It's a very impacting situation for systems with 4GB or RAM which will suffer severe performance degradation. Think twice before installing!

A supplemental update was issued to address and fix the problem.