I don't see whats so hard about updating it.
Open application manager, press update, select the Maemo5 update. If it fails, its because you installed incompatible devel software written by community members and is entirely unrelated to Nokia.

If for some reason the above is too complicated for you to understand though, Windows 7 x86 flasher is about the easiest thing in the universe to use. It's one command line, it's not hard. And before you ***** about "its non user friendly, why am I having to enter commands" and various other QQ, consider that the whole point of the Flasher is for power users/developers - If you're clueless (hint: you are) you should be using the pretty colourful updater provided by NSU or Ovi suite.