Hi @Jake Lo!
I'm trying to (fresh) install the High Sierra on my "old" Dell 3480.
I've tried to use the settings that you gave me for 5480 and obviously it doesn't work. I've found here a working solution for 3450 and tried it too. The result was better, but I got myself stuck on this screen:
The specs are:
Dell 3480
BIOS 1.8.0
Intel Core i7-7500U
16 GB
Video - Intel HD Graphics (not sure if its 620 or 520)
Audio Realtek ALC3246
Wifi Qualcomm Wireless (probably DW1820)
Find attached the origin folder with the ACPI dump.
origin.zip
And the EFI folder
EFI.zip
Can you help me?
Cheers,
Rafael Siqueira