Replacing Boot Drivers

WinDbg documentation says to replace a boot driver file using .kdfiles, we
need to connect the kernel debugger to the Windows boot loader (Ntldr), and
*not* to the Windows kernel. Thus we need the special debugger-enabled
version of Ntldr. It further says that this version of Ntldr can be found in
the Windows Driver Kit, in the *%DDKROOT%\debug* directory.

But upon checking I could not find any such file. Has the location been
changed (though a search turned out to be negative).

By using the technique for installing a partially checked build ( I have the
MSDN checked build of 2k) can I replace NTLDR ( the size of teh file is 242
KB ).

Also, isn’t there any way of replacing boot drivers on EFI machines?

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