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Cannot get past security check. I put characters in exactly the way they look and it still says incorrect, no matter how many times I do it.

In this case we would suggest you to uninstall the app and perform hard reset on the modem then after modem reboots install the app and setup. 

http://arris.force.com/consumers/articles/General_FAQs/SURFboard-Central-Wi-Fi-Cable-Modem-Setup