Fixing a bricked D-Link DSL-G624T

My Parents have a D-Link DSL-G624T ADSL modem/switch. Unfortunately, my brother decided to update its firmware, crashing it in the process. After a bit of remote debugging over the phone, we thought the best option was to send it to me.

The symptoms were as follows: The power LED came on as normal, the status LED was flashing as normal - indicating that it was at least booting up. The LAN link LEDs would light up when an ethernet cable was plugged in. However, its web administration panel couldn’t be reached on http://192.168.1.1 and it couldn’t be pinged either.

After a lot of searching, reading and failed attempts at repairing it, I have found a method to reset the firmware without the web interface. Quite why D-Link make it so awkward for their UK customers, I don’t know.
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