Before downloading anything, you must know exactly what is running on your device.
The D-Link DSL-224 is a wireless N300 ADSL2+ modem router, and its firmware plays a crucial role in its performance and feature set. Here's a brief review of the firmware: dlink dsl224 firmware
After the router reboots, log back in. Go to Management > Settings > Restore Default (or press the physical reset button for 10 seconds). This clears old configuration fragments that might conflict with the new firmware. Before downloading anything, you must know exactly what
Ensure the firmware matches your hardware revision exactly. Before downloading anything