Can't see your pic. Since you are a new poster, it likely needs to be approved by a Forum Admin.
You could try hosting it at one of those free third-party pic hosting sites and post the link to it here.
What exactly are you trying to do ? Do you just want to access the User Interface pages ?
What is the "password of the day" for CM820A?
I never knew one existed and it changes daily?
The "password of the day" was a way to address a vulnerability that allowed outside actors to access the advanced settings of the older model ARRIS modems.
Newer firmware prevents this nowadays, but if you *really* need to look at the advanced settings, there are password generators all over the internet. I'm not going to link to them as I have no way to verify their authenticity, veracity or safety. I doubt you can even change them anyway, as they are set by the ISP.