Ah, the memories. The N-Gage was my first true smartphone and it taught me how phones could be so much more than just a device that can make calls. And showing everyone I knew tomb raider running on a phone was an all to frequent highlight.

I "bricked" my 1st n-gage trying to get an early build of doom running on it (I too have been meaning to flash it), then bought a QD later on. I still prefer the original n-gage.

I'm afraid it has been too long since I last booted my QD up to be of any meaningful help.

Edit: Looking at theallaboutsymbian thread, you could try formatting the card in the N-Gage itself or formatting the card in a similar Nokia device such as the 6230.