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Hi ! Finally the message has gone.... So now looks everything OK ! (In this NEW installation ). Maybe there were too many times changed the EFI, and something mixed.... I hope it will remain like that. other: I tried the new CCC - 6 for Monterey. I could not make a bootable clone . Do you use carbon copy clone app? Is any solution to make a security bootable backup to an external disk of Monterey? ...In "Mojave times" it was so simply... Just a theoretical question for the future : For the installation USB : Can I put the ready made EFI to the EFI partition, or is it better to use a much more simply EFI for the installation ?

I reinstalled the system... It was going very smoothly and took about 1 hour..... BUT in beginning, - just befor the booting there is a message: "OCS: No schema for AllowNvramReset at 0 index, context <Security> !" "OCS: No schema for AllowToggleSip at 2 index, context <Security> ! " After this message the machine boots quick at seems everything OK .... I use OC version 8.0.... I dont know what cause this message..... As the matter of fact I downloaded the install USB EFI for skylake laptops. Maybe it is not version 8.0 .... How can I check on an EFI folder which version of OC was made ? But anyway when I install the OS there is no message, but my system HDD (SSD) EFI partition is empti during the installation.... so no chance to mixing the installation EFI to the EFI of system harddisk. SO.... a big ??????

Dear Baio77 Now I have a strange message: "Volume Hash Mismatch" "Hash mismatch detected on volume disk1s5. macOS should be reinstalled on this volume " Otherwise the system works perfectly, so i dont know what to do.... I just purchased a Monterey compatible cloner ( CCC-6 ) Do I make a copy? Or ignore this message or really start to insall again ? Now it is much easier, because - thanking to you - I have a perfect EFI ? What do you suggest. What is the disk1s5 at all ? I thought I have only 3 partition: main+EFI+recovery....data and uptate is separate partition? The 5th is the update?

DEAR BAIO77 ! You are a real helpful gentleman ! I think now my machine is really complete ! THANKS A MILLION your time and your helping attitude ! You are a GREAT MAN ! THANK YOU again !

THANK YOU !!!!! Actualy meantime I found this morning this link on youtube: I changed the AAPL-igplatform-id to my 00001619 others are the same as HD620 because I did not find the values for HD520.... BUT, this was finally OK !!!! I had HDMI with perfect audio.... I see your solution is a bit different and also works fine !!!!! THANK YOU !!! The LID close/open "sleep managment" also works very well. I found only that the first time sleep is going fast. After the waking up the computer, the second/ third times sleep takes a bit longer, but works ! With your EFI the keyboard "0" and "í" (beside of "y") letters changed.... I send you the new ioregfile: ioreg5480 05-22.zip

Hi, My new ioreg is enclosed . Finally I found that the HDMI output is dead .... The mirroring via "Air-play" is working perfectly, so I can put a video to TV, but I can not use a second monitor.... dell5480_0521.zip I found this page for lid open/close for sleep/wake : https://dortania.github.io/OpenCore-Post-Install/usb/misc/instant-wake.html. actually it looks too high level for me.... At the moment the sleep/wake is controlled by the power button only.... the lid open/close does not work.

DEAR FRIEND !!!! I wish to invite you for some beers !!!!!!!! Please let me know how can I add my contribution ! You EFI made the miracle ! I have trackpad, brightness control and sleep !!!! WONDERFUL ! ... the sleep looks perfect... I have Hackintool ( new for me, because I was in clover upto now), please let me know how can I check the sleep function and how to map ports there.... Again : THANK YOU VERY MUCH !!!!! Now I have a mac (dell) - it is a "DEC" laptop ! I really seriously said the beer invitation, so let me know where to send some paypal (beer) contribution....

I successfully installed the latest Monterey. Almost everything is perfect except : 1., No trackpad (even no any mouse function!) That is the main problem . 2., No sleeps. For clicking to the sleep the display get dark but after 1-2 minutes, the display waking up, and I think the power does not sleep at all.... 3., The screen brightness can not be controlled by the keyboard. (not so important...) But works the WIFI/bluetooth (with bcm4360) even the handoff is perfect. Also working - beside the basic functions - the card reader. So almost everything is good but the trackpad would be very essential ! I enclose my ioreg file here, and my EFI file here: https://drive.google.com/file/d/1OvBA_rblHopHJtZBo39c9EbjDQnT7hSw/view?usp=sharing EFI.zip dell5480 MacBook Pro.zip