Accidently formatted my garmin Nuvi 255W!!

[layedback]

I have a Garmin nuvi 255w that I gave to my son and he accidently formatted the unit itself instead of the SD card and now it won't work properly. Stupid me, I never thought of backing it up and now it's just a useless paperweight.
I searched everywhere (even here!!) to see if I can recover the missing files to no avail. I called the Garmin company and they were no help, they basically told me to toss it in the trash and buy a new one. If anyone can help with this I'll greatly appreciate it!!

Thanks!!