I have a SB8200 and have tried:
admin & PW.
admin & last 8 of S/N.
cusadmin & password.
cusadmin & last 8.
Also all variations with no pw just enter (“blank”).
Nothing works!
Unable to login the GUi webportal on SB8200
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According to their FAQ, the username is admin (all lowercase) and the password is the last 8 of the s/n. If the password is changed, you’ll need to perform factory reset. I don’t think they use cusadmin for username.
https://arris.my.salesforce-sites.com/consumers/articles/General_FAQs/SB8200-Web-Manager-Access
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