If you just relied on what initially came programmed with the scanner, you can reinitialize it from the factory default (p.99 of manual).
If you do programming of your own, and to prevent a mishap in the field from totally messing up a working setup, make a backup into a v-folder. (p.74/75/76) Then if you mess things up and want to go back to say yesterday's programming, you can reload a v-folder and be back in business.
I *love* the v-folder feature of the Pro106 for backups.