Jake Lo

ok, try this one Fixed the issue config.plist.zip

forgot you're on Catalina. Replace the new files with this Config.plist config.plist.zip

try at boot gui, hit the space bar and then select Reset NVRam. I only update the above files with new kexts and OC drivers and updating the config for OC 0.8.0 https://www.insanelymac.com/forum/782-opencore-releases/

Post full system specs and EFI folder you're using

give this a try If it doesn't boot, no need to reinstall, just restore the EFI folder Or best to test it on an USB bootable drive 7480_Intelwifi.zip

Give this a try, upgrade to OC 0.8.0 with latest kexts replace into EFI E5570_OC_0.8.0.zip

Not booting or Intel Wireless not working?

Post your system's full spec Depending on the specs, if you have an NVMe Samsung PM981, PM981a and similar, they are not supported. Then boot in verbose mode to see where your boot hangs/freezes. A screenshot such as the one you posted is not useful at all.

There are many existing threads about Latitude 7480. If anything else, do post your system's specs. Those laptops exist in Skylake and Kaby Lake models...

Post IOReg file using IORegistryExplorer.app v2.1

https://github.com/acidanthera/OpenCorePkg/releases

try this: Delete the following /Library/Preferences/com.apple.PowerManagement* Reboot and set to these settings: sudo pmset -a hibernatemode 0 sudo rm -f /var/vm/sleepimage sudo pmset -a hibernatefile /dev/null sudo pmset -a standby 0 sudo pmset -a powernap 0 sudo pmset -a autopoweroff 0

Here you go, give this a try. Updated to OC 080 with latest kexts Select config-intelwifi and rename it to config.plist if you have the Intel/BT combo. Latitude 7490 OC0.8.0.zip

the edit is not saved. Here, edited it, removed the # config.plist.zip

Try my HP EliteBook 840 G3 EFI, basically the same hardware, just use the config-intelwifi.plist for your Intel wifi card. Might have to create your own USBPorts kext but we could work on that afterwards.

Just open a command prompt in Windows and run this command reboot. Set the time again if needed Reg add HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation /v RealTimeIsUniversal /t REG_DWORD /d 1

Post your Big Sur files include IOReg file is possible Please include your system specs as well

@robi62 Upgrade OC and the kexts to the latest

Sorry, not familiar with that external USB drive. The internal WD is supported. Try a different external SSD. It could also be that the USB ports was not detected or lost connection when system is about to initialize.

According to the thread, USB-C works. HDMI might be hardcoded to the Nvidia which is disabled since it's not supported.

check this thread https://osxlatitude.com/forums/topic/15182-latitude-5591-no-hdmi-output/

Your signature shows you're installing to an external SSD drive but what is the model of the internal drive? It might be what's causing the crash, in that case it can be disable via SSDT patching.

try voodoops2Controller by SkyrilHD

System is a Skylake with HD 515, not Kabylake nor WhiskeyLake. He's using the EFI from the link I provided about DVMT above posted by the OP It's a bit outdated.

Please post full system specs. What model is the hdd/NVMe?