4Nub15

Hello Jake, thanks for your comments. I changed the options on my archive config.plist. My HDMI works now. But the screen on my laptop goes black. This problems is the same when my laptop sleep. The Legacy Option ROMs is disable.

Hello. This is a mini guide to how upgrade Sierra to High Sierra on Dell Latitude E7270. 1- Generate a backup of your information, I recommend using time machine is a good tool that can help us restore our information. 2- Upgrade clover to last version. (latest available at time of writing). 3- Download apfs.efi.zip and put it in your EFI partition: /EFI/CLOVER/drivers64UEFI/. This is the new driver of Apple File System APFS. 4- Update Sierra kexts and place them under /EFI/CLOVER/kexts/Other/ (Create the folder if it doesn't exists). In my case, I'm using those kexts: E7270 HS EFI kexts.zip 5- Download this config.plist.zip. 6- Edit config.plist with Clover Configuration. (Upgrade Clover Configuration to last version, in my case I'm using Clover Configuration 4.53) and active Fix Headers option under Acpi. 7- Reboot Sierra and check the everything is OK. 8- Download High Sierra from Mac App Store and follow instructions, The installation process will reboot your laptop, you will also notice a new option in Clover bootloader, don't move anything there, just let it reboot and choose the boot option automatically (if you have boot timeout activated it will boot with the new auto-selected option). 9- Finally, you must rebuild cache and repair permissions, open a terminal and execute the following commands: sudo chmod -Rf 755 /L*/E* sudo chown -Rf 0:0 /L*/E* sudo chmod -Rf 755 /S*/L*/E* sudo chown -Rf 0:0 /S*/L*/E* sudo touch -f /L*/E* sudo touch -f /S*/L*/E* sudo kextcache -Boot -U / issues detected: 1- HDMI doesn't work Fixed by replacing SMBIOS with MBP13,1 2- Problems with hibernation (When you close your laptop or sleep, the screen goes black and doesn't return the login option.) See fix on post #9 below Thanks Schiller and Jake Lo , for your contributions. Regards.