Thanks for visiting our Comcast Business Support Forums, airguard172. Depending on what password you're trying to reset, resetting your modem's password is pretty easy.
If you're trying to reset the password for the Wi-Fi, you can log into the modem using the modems primary gateway LAN address (usually 10.1.10.1) by connecting to your modem using an Ethernet cord or a device that's already connected via Wi-Fi. Please keep in mind that resetting your Wi-Fi password from a wirelessly connected device will cause that device to lose connection. You will need to enter the new Wi-Fi password to access your Comcast wireless network.
If you're trying to reset the Cusadmin password, you will need to perform a factory reset on the Comcast Business Modem. To hard reset the Comcast Modem, start by using a small object (paper clip or pin) to hold in the reset button on the back of the device. Hold the button for more than 15 seconds to perform a factory reset to restore all factory default settings.) Wait two minutes to allow the modem to completely restart before moving on to the next step. Once Complete, you will be able to access the Comcast Business Modems admin tool using the default log in. Please note that doing so will remove any setting and/or Static IP address you may have had on the modem.
If you still need assistance please, send me a private message with your full name and phone number. I'd be more than happy to assist you.