If it is inaccessible by software means, there is no way to reset it (except sending it in to the manufacturer, but even that might not work as it’s an old device). Because, this device has no hardware reset button. For that reason, I strongly advise against this device. In addition, its software (PS Admin v3.00) is very old, 2004 or older, and also “looks” that old.
You can do the following to try accessing the device by software:
- Try accessing it via its http://dlink-xxxxxx hostname, where xxxxxx are to be replaced by the last 6 digits of its MAC address.
- Try accessing it via its default IP address 192.168.0.10. Also try 192.168.1.10 and 192.168.1.240 [source].
- Look into the protocol of your DHCP server to find out about its IP address. However, if the device has been set up to a manual IP configuration, no address will be shown there of course.
- Try listing the device using the “Discover” function in PS Admin 3.0. You can download PS Admin v3.00 from dlink.it.
- For the default password of the web interface, see here.