Honda Nuvi 350.. can I change firmware?

 

Hi guys, noob here.. just want to start off by thanking everyone for making my GPS receiver that much cooler. I have already made my own vehicle icon and added the speed\redlight cam list. Being a Honda fan, I couldn't pass up this unit with its cool Honda logo and splash screen (that was before I found out I could make my own). It also has every dealership programmed as POIs. However, It seems that I have a different version than the regular 350's.. not sure exactly what is different but it seems that I cannot change my splash screen. Also, I just helped my friend edit his Warning screen (nuvi 200) by modifying the his text file... but I cannot find it on mine, I don't even have a text folder, like he does. I was hoping that maybe I could load the normal 350 firmware onto it to possibly unlock some of these other options. Any thoughts? I have installed the webupdater but It says there are only minor upgrades, like vehicles and such.