Linksys FGMM1000 - Administration: Factory Reset and Firmware Update; Factory Reset Procedure; Firmware Update Process

Factory Reset
Resets all router settings to factory defaults. You can restore settings if you saves a configuration file in the
Restore/Backup screen.
Firmware Update
Set to automatic updates to keep your router up to date effortlessly. If you choose not to enable automatic
updates, you can download firmware files and manually update.