Hi,
I recently bought the same notebook tho I can't even install mojave on my Dell 15 7586 2 in 1. I hope we are talking the same laptop. Could you please share your bios config ? Did you do any setup_var hack to the bios ? I've seen this with some dell xps to unable cfg, etc ? I dont know if there is any issue with my laptop cus fingerprint reader doesnt work, headphone jack the same. For instance it came with windows 10 installed on nvme drive, if I try to install windows 8 on the sata drive it doesnt boot on it and there is a blue screen. Any help could be appreciated. My main focus is the hackintosh but I'm thinking it could an issue with my laptop. Thanks for the support.