Unrelated, but that is a seriously outdated grub4dos.
The "current/suggested" grub4dos is right now the 0.4.6.a 2017-08-30:
or (the previous branch "last") 0.4.5c-2016-01-18:
As a side not the dd.exe from the FAU has already been reported to have some "peculiar beaviour", but in any case the command line is "philosophically wrong", as the "bs=" parameter normally does not work that way. (the blocksize normally should be a power of 2).
Mind you, most probably a number of dd versions will accept bs=440 count=1 just fine, but in theory they shouldn't.
You can try with bs=1 count=440, but probably it won't work anyway with the FAU which is more a dedicated disk imaging tool than an actual dd.
Just for the record and FYI, I simply cannot bear the specific version/release (which has its own uses BTW), because - besides being a huge mass of bloat - it has this "feature" of attempting to translate itself into the OS language with results that in Italian are appalling, besides being extremely verbose and sometimes even "patronizing".
And given the endless amount of (possibly very useful in a few intended uses) of unneeded complications in the command line, it is simply not dd (anymore) but a totally dfferent program that tricks everyone into believing tht it is dd.
Issue is that I have no handy idea right now for a (stupid) 64 bit version of dd (or similar) apart the stupid (for further reasons besides the 64 bits) Cygwin one.
Most probably the Cygwin (64 bit version) would work nicely, but just like the 32 bit version:
getting it will be in itself a challenge.
More or less you need (this is my 32 bit setup):
So you need to download (for 64 bit):
To look for what files are in what package, you can use:
Even founding the above is in itself a challenge and of course it doesn't tell you that libintl8 is under gettext.