It's not enough with only reset...You have to do a "factory reset" put the sd-card with the package above installed...reset in the bottom....directly after a reset hold power-button for a couple of seconds while the PDA is connected to external power.
Than You can see the 5 secs countdown for Factory settings...
Wait a couple of minute for the update sequence (starts automaticly)
If it's not working try to format the sd-card to FAT32!
Hello, hope is not too late ,here is firmware of navigon 2100 max.
A few instructions turn off your unit,insert sd card with this files (extracted),turn on your gps unit,and then wait ,until is done.Enjoy!
PS: sorry for my english hope you understanding!