Hi there,
Thank you for an amazing guide.
However, I still can’t make my NVMe works 
My laptop is ASUS UX501JW with HM87 chipset. My new NVMe SSD is Silicon Power P34A80 1TB (https://www.silicon-power.com/web/product-P34A80)
Here is what I did:
1. I dumped the stock BIOS with AFUWINx64.
2. Then I inserted NvmExpressDxe_4 with UEFItool.
3. I flashed the modded BIOS with AFUWINx64 then reboot.
4. I dumped again and the NVMe DXE module is there.
My NVMe SSD doesn’t show in the BIOS or in the Windows 10 setup. I have AHCI on and disabled CMS, secure boot, fast boot but still no luck.
Please help me