sdb1, EFI System, FAT(32-bit) - Mounted at /boot/efi

sdb2, Basic Data, NTFS (my windows files)

sdb3, Linux Filesystem Ext4

sdb4, Linux Swap

insmod part_gpt
insmod fat
set root='(hd1,2)'
if [ x$feature_platform_search_hint = xy ]; then
  search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt1 --hint-efi=hd1,gpt1 --hint-baremetal=ahci1,gpt1  4EE5-A75E
else
  search --no-floppy --fs-uuid --set=root 4EE5-A75E
fi
chainloader /EFI/Microsoft/Boot/bootmgfw.efi