I would pull an Elop just to steal his 'worst CEO of any large company ever' title.

1. I would write a memo in which I take a massive **** on everything Nokia has ever done and deem all our products not worth buying.
2. I would of course leak the memo to the public.
3. Next I would introduce a really awesome in-house developed phone that receives great reviews and then say that it will not be supported no matter what. I'm not so sure why I'm doing this, but whatever..
4. I would rest Nokia's smartphone future on some obscure marginal OS like RIM's QNX or MS WP7 and not release any phones with it for at least one year.
5. Meanwhile, I would fire everyone who ever had something to do with in-house software developing just so there's no going back no matter what.
6. That's about it.

I also have a plan B, but I'll leave that for later..