This thread was splitted from this one:
Does "<os>" only accept Win98 ?
Has anyone a good solution to update the PBR that it's load NTLDR?
It depends on what you call good.
A bootsector can be extracted, just like the MBR, from a system file in the source, the original "BOOTMGR" bootsector can be extracted fromthe formatted volume, then the two can be manipulated via batch and rewritten through dsfo/dsfi.
In other words the things that I do with mbrbatch/makebs: