The approach is everything. Harassment will backfire. Fact-based appeals *should* have positive effect but, have not been successful for the most part.

I say that as a former Nokia engineer with many, many contacts in the company who have heard from me many, many times.

As for your last statement-- don't get hung up over perceived "rights". They vary from region to region and even if you have a right to updated software, it often takes legal action when a product has been abandoned.