Just in case it's relevant (I've just managed, eventually, to successfully update my German i7500 to H8 via NPS), a fella in the other thread mentioned turning off the "Mass storage only" option under Settings / About Phone / Additional Settings.
NPS wasn't successfully recognising my phone, and it was either changing that setting [which makes a bit of sense] or the uninstall / reinstall of NPS [*and* they myriad additional "Samsung ... driver" applications that came with it] that sorted out my phone-to-W2K interface. [Until then, only the mass storage devices were showing up; no phone in drop down or on the app's "desktop".]
HTH
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