@Jake Lo
 
	I made a new fresh install.
 
	I first installed Catalina with the OpenCore method. Then I upgraded directly to Big Sur with the AppStore.
 
	Then I used the EFI Latitude 5510 folder you posted. I had a compatibility concern with OpenRuntime r12, r11 was required. 
 
	Then I remembered that @murkie posted different EFI.zip. I took the last one he posted. I mix with your files to find the good settings. After several tries, I managed to make an EFI file that works well. 
	Everything works like a charm (Graphics, WIFI, Ethernet, Bluetooth, HDMI, Audio, Camera, Keyboard, Backlight, Hotkeys, Volume buttons, fn Key for brightness, Sleep/Wake). 
	Only the trackpad does not work at all. 
	It drives me crazy Ahahaha  
	 
 
	 
 
	 
 
 
Latitude 5510 HackBookPro.ioreg 
config.plist.zip