Out of habit I have been going through the #Gentoo AMD64 handbook setting up for efi, only for me to get to the bootloader step and realizing I have #Coreboot on this X230T and I don't use efi. I hope I can recover this install with out too much issue
@rain You can use GPT on BIOS systems without too much effort. Alternatively, use fdisk to print out the current partition layout, format as MBR and re-create the partitions with the exact same offsets/sizes.
Out of habit I have been going through the 
