Dell 5515 BIOS upgrade fails due to not room in EFS partition. I don't understand this stuff but read that is allocated to something called UEFI used to boot the laptop. I can see 97MB of the 100MB partition is used. Windows Disk manager will only shrink C: form the right whereas I need an unallocated partition to the left. I've tried windows tools and free versions of partition tools but none will allow me to shrink Windows C from the left, or create an unallocated partition and move that next to the UEFI partition so I can expand that.