I am unable to log in my Gateway Admin Portal. Message says "Incorrect password for admin". Can you please reset the password to factory?

... Can you please reset the password to factory?

If the password on the device label doesn't work and "password" doesn't work either, see https://www.xfinity.com/support/articles/troubleshooting-your-cable-modem:

A factory reset restores your Gateway to its original default settings, including your WiFi name and password. A factory reset requires using a non-metallic pointed object (such as a toothpick) to hold in the Reset button on the back of the Gateway for 30 seconds until all the LED lights power off. If prompted, you’ll be required to create a custom WiFi name and password and reconnect devices to your home network using this information.

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Thanks for the information.  Is there a way to reset admin password for  http://10.0.0.1 (the Admin Tool) without changing My WIFI name and password etc?

Is there a way to reset admin password for  http://10.0.0.1 (the Admin Tool) without changing My WIFI name and password etc?

That is probably possible for Comcast to do, but getting them to do it is probably impossible as it would cost them a few pennies. I know of no way for for a customer to recover from a gateway "incorrect password" condition except by the data-destructive factory reset procedure.

factory reset???  and no way to save all the settings? 
I changed the password year ago and saved. never logged after. Now I can't login with my saved password neither default.