I will finish it for You: ...if used at Linux box

As You were suggesting to use Linux, I was already at the process of installing Ubuntu - and as You predicted, linux version of flasher connected right away and I was able to cold flash my N900 (after adapting the command to my hardware revision). So I`m back, thanks for Your inputs guys.

@raandoom
I`ve already deleted that image (prior to reading You post), but as I can see You already found what is wrong. Glad that I could help in some way to beta test your "Boot logo changer"