i'm booting EFI, not sure if i have ESP mounted ?
i'm booting from /dev/sdf, grub is installed on /dev/sdd
fdisk -l /dev/sdd
Disk /dev/sdd: 29.3 GiB, 31457280000 bytes, 61440000 sectors
Disk model: PHILIPS
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes...