jado, the firmware should be available for download at your routers MFG home page under product "router model" support/downloads section

The firmware upgrade needs to be done from a PC that is connected to the router via wired ethernet. Follow their firmware instructions, they warn against using "wireless" for the firmware upgrade, it will result in firmware upgrade failure, which means your router will wind up as a doorstop

If you get the password prompt to log into your router, the default login for your router is;
User:Admin
Password:

If the default password does not, work look for the reset switch on your router. The reset switch is usually a small hole with a button inside, use a toothpick or something non metalic to press and hold the button while the router is powered up. A few lights will light up, or all the lights will go out and the router will restart itself, indication that the configuration has reset to factory defaults, from there you should be able to use the default login.

http://support.dlink.com/faq/view.as...eneral-Routers