Mounting EFI issue

Hello people, I've recently got MacOS installed on my Lenovo V520S

Specs: i5-7400 8GB DDR4 RAM Intel HD630 (no dGPU)

As I had a Samsung NVME and installation kept failing, I installed it on a USB Hard Drive just to test it before purchasing a Sata SSD. After installation, I've removed the Samsung NVME

As I got a HD630, I'm facing the 7MB VRAM issue and I need to mount the EFI to patch video.

But opencore configurator doesn't find my EFI, only my Windows EFI if my Samsung NVME is installed. MountEFI doesn't work either (there is no efi partition). I can't even copy it to the drive so that i don't need the USB to boot

What stupid mistake have I done? Thanks in advance

Sorry for the bad quality,