Do not attempt custom firmware on the DSL-2877AL unless you are a developer with a JTAG debugger. Stick to official D-Link builds.
The is the brain of your network. Keeping it updated is not a "set and forget" task—it is an essential maintenance chore that enhances speed, closes security holes, and prevents those annoying 2 AM disconnections. Dsl-2877al Firmware
Do not turn off the router or close the browser window while the progress bar is moving. The process usually takes 2–5 minutes. Troubleshooting Common Issues Do not attempt custom firmware on the DSL-2877AL