It only took me 5 days to KILL my new Nokia 3650. I had installed, uninstalled, and hacked so many things that it was horribly slow and wouldn’t accept new installations because certain other things weren’t removed properly. So, I did a factory reset of all the system software by typing "*#7370#". This could also be done by going to "Menu -> Tools -> Settings -> Phone -> General -> Orig. Phone Settings". Now, the phone works great…. as long as the MMC isn’t in. As soon as I pop the MMC in, all I get is SYSTEM ERROR after the phone boots.
Doh!
Luckily, I found that if you hold down the pencil when booting, you’ll boot into safe mode. From there, you can go to "Menu -> Extras -> Memory -> Options -> Format mem. card" to format the memory card. Now, it’s like I have a brand new phone. Time to start all over. :)