You have to visit the [CA version of the router’s site](http://www.dlink.com/ca/en/support/product/dir-601-wireless-n-150-home-router?revision=ca_reva) to get the 1.04 version, which only boasts one extra feature:
> Enhance WPS-Pin security concern
Hope this helps!
You can find the other firmware in the FTP directory at:
ftp://ftp.dlink.com/Gateway/dir601/Firmware/
