Changing 0x31 or 0x30 in the nuvi 2xx FW won't fix the problem. Even if you success to enter in the nuvi memory and again format the flash memory in FAT I bet nuvi will still reboot. As you have seen the so called "cure" FW also won't help. If the nuvi was other model I know how this can be fixed but nuvi 200 are diferent. I have an idea and I think I can prepare a special FW in the next few days. The bad thing is that I don't know is it going to help or it could go worse.

Cheers,