lost my card off the back of the router

[#1]

I have lost the card with the password for the router on it, if I reset the router will i be any further forward as i don't know what was on the card? or is there someother way I can retrieve my password?

many thanks i advance for help.

[#2]

If it's a Hub One the details are also printed on a label on the bottom of the router.

[#3]

The hub zero, also known as the Sagemcom 2704n also has a sticker on the bottom with the default passwords.