D-Link DSL-2540U User Manual page 52

Section 3 – Configuration
Settings – Update
Click Browse to select a file and click the Update Settings button to
update the Router settings.
Settings – Restore Default
Click the Restore Default Settings button to reset your Router back to
the factory default settings including IP settings (192.168.1.1) and
Administrator password (admin).
D-Link DSL-2540U User Manual 52