An Nguyễn

I reset bios and it works perfectly with your EFI.
Thanks for supporting me. 

I tested a few days. This solution does not work. I am researching for a new solution for this problem.

it seems to work, I'll test it for a few more days.
Thank you very much 

I created kext from FixEDID app and used this kext in OC, But it does not work.

I will try your solution.

Can you share your EFI with me?

I tried the first way, but it does not work.

if I create custom edid, I don't know where to put it in open core

Can I fix EDID this way?
https://github.com/mrhuy92/Dell-Percision-5510-OSX/tree/10.15/Dell 5510 4K EDID
Or do I have to inject Custom EDID into config.plist.

Hi @all,

I am using dell precision 5510 - I7 6820HQ, 16GB, 512GB, 4K screen. I installed macOS 10.15.6 with open core version 0.6.0.

But I can't wake up from sleep. It has been black screen while the keyboard and power button are still active.
 

My EFI

EFI.zip

I am upgrading my EFI for mac 10.15.4, but it stuck in alps loader.