So, the Isos, which are having files ( extracted ) larger than 4GB, has to be applied to the boot media with some tricks. But FAT32 can only support files that are less than or equal to 4GB. Normally, UEFI boot needs a FAT32 format drive or such partition on the boot drive.With customized ISOs, it will always be experimental and may support one or the other.
Most UEFI systems will be able to boot only 圆4 boot media in UEFI mode as here.
