My gear:
-Dell Latitude E5470 i5 6440hq Intel HD 520
-Jake LO's E7470 Efi
1-Go to "boot args" and delete "-igfxonln=1" and
add "-igfxblr"
2-Copy this EFI instead of the EFI in your USB installation key
And boom
3- To have the wifi use "conf.intelwifi.plist" by renaming it
"config.plist" and do the same manipulation