To download a PDF for the user guide for SBG8300, I would suggest visiting www.arris.com/consumersupport.

Select your product model number (SBG8300). Under the specifications section, you will find the User Guide.

i did that two days ago and AGAIN just now it does not take meto anything that looks like a PDF file.  I will try it one more time.

Please try to visit the link below, where you can find the option to download the PDF for the SBG8300 user guide

https://arris.my.salesforce-sites.com/consumers/ConsumerProductDetail?p=a0h0c00000P1guoAAB&c=SURFboard%20Gateways&pageIdentifier=docs