[Guide] Dell Inspiron 15 7559 (skylake)

[Zurdok]

I have found a way to get UEFI to boot and work every single time on the 7559 i5 non 4k and i7 full 4k. It involves using the boot maintenance manager grey screen as it is called. If you need help let me know. I now have a flawless open core big sur on both of my dell 7559s. A way to test this, is to have a legacy configured open core or clover usb. Make sure it flashes 7 before going to whichever, now boot your dell as you normally would but right when you see 7, unplug the usb. This will take you to the grey screen I am talking about, and it is the key to stable UEFI open core on these machines. Once you are at this screen with another blank usb thumb-drive that only has the UEFI efi file on it, without it being partitioned( if it is partitioned with say legacy mbr clover or opencore, it will just attempt to boot from this opencore or clover installation incorrectly) plugged in, navigate to your uefi opencore and boot it. This is done by opening the boot maintenance manager folder, and then selecting boot from file, then navigating to your opencore.efi file. I used a legacy thumb-drive to remove and a nonbootloader-formatted UEFI thumb-drive with the opencore efi folder just sitting in it and it worked great. A way to finalize this is to corrupt the legacy boot, boot0, and boot1f32 files, I did so by using all the clover legacy boot files in my opencore efi hdd efi partition. This way it always boots to the grey screen. This is convoluted at first but it was the only way I could progress from legacy only to UEFI with the newest 7559 bios and no battery ribbon unplug. The only problem is the grey screen is extremely small on the 4k model.

Brilliant workaround! I used to get that grey screen and booted opencore from there, it didn't appear all the time though, I'm currently booting Opencore on my i5 7559 now using your solution.

Thanks a lot!

 

[hlfhi]

N

Brilliant workaround! I used to get that grey screen and booted opencore from there, it didn't appear all the time though, I'm currently booting Opencore on my i5 7559 now using your solution.

Thanks a lot!

No problem! I’m glad it helped!

 

[Zurdok]

So, everything was working fine on Catalina bit once I updated to Big Sur I'm getting this error on boot. Any idea what this could be?

 

[hlfhi]

Big Sur has different open core requirements than Catalina I have big Sur working on my 7559s look in my post and comment history and try the efi I called amazing. This is now an issue not with the work around but your open core efi.

 

[Zurdok]

Big Sur has different open core requirements than Catalina I have big Sur working on my 7559s look in my post and comment history and try the efi I called amazing. This is now an issue not with the work around but your open core efi.

Just tried that EFI, the verbose now proceeds but I'm getting a black screen. It's probably because I've got a 1080p screen

Edit: macos apparently boots, if I press a key I'm getting sound effects, I'm just getting no picture at all.

 

[hlfhi]

Just tried that EFI, the verbose now proceeds but I'm getting a black screen. It's probably because I've got a 1080p screen

Edit: macos apparently boots, if I press a key I'm getting sound effects, I'm just getting no picture at all.

What version of big Sur are you now on I think with that EFI the highest I got was like 11.03 Ill check later.

 

[hlfhi]

Just tried that EFI, the verbose now proceeds but I'm getting a black screen. It's probably because I've got a 1080p screen

Edit: macos apparently boots, if I press a key I'm getting sound effects, I'm just getting no picture at all.

Okay that sounds like the efi you got has the edid for the 4k screen.

 

[Zurdok]

Okay that sounds like the efi you got has the edid for the 4k screen.

That did the trick! (So far!) Thank again for your help!

Edit: After ironing some annoyances I managed to upgrade to OC 0.6.9 and I'm flawlessly running Big Sur 11.4

Thanks again hlfhi!

 

[rajivmilhomem]

That did the trick! (So far!) Thank again for your help!

Edit: After ironing some annoyances I managed to upgrade to OC 0.6.9 and I'm flawlessly running Big Sur 11.4

Thanks again hlfhi!

How did you get it, I don't know what to do, mine is an i5 too. Did I get your EFI and where did you download the BigSur image you are using?

 

[Zurdok]

How did you get it, I don't know what to do, mine is an i5 too. Did I get your EFI and where did you download the BigSur image you are using?

I used hlfhi's method to boot OC, I updated Catalina OTA, updated but got the error I posted before, started using hlfhi's suggested EFI, removed the EDID for the 4k monitor and finally updated OpenCore. What problem are you having?