OK, first off look at this >

http://www.youtube.com/watch?v=Zeet3k1_330

Then download and install NaviFirm+ and Phoenix.

Open up NaviFirm+, in Products scroll to N9 and click to open. In Releases click on 30.2012.7.1. Above Variants click 'Export PC List' to expand all variants. Then take a look around and see what you think may benefit you, maybe google for extra info.

***Whatever F/W version you decide to use can be changed in the future.*** Incorrect - see next post below

Just remember that this could possibly brick your phone, but I have used it multiple times on my N8, E7 and N9 without any problems.

Abiove all make sure you do exactly as instructed in the vid. If you are still unsure and have questions then let me know.

Good luck