I will try and explain it in a simple way
say you removed your hard drive from your pc
and fitted a brand new one
it wouldnt boot into windows
would it
the easiest way to fix it is to clone partition 1 and 2 from the old drive onto the new one
with a pc it will then boot but the partitions will be missing
you can then do a debug firmware update with rebuild partitions enabled
dont mess with the old drive in any way as you always have a backup drive that works then