Is it compatable/approved with/for Xfinity?

The Arris S33 Docsis 3.1 modem is currently only compatible with the 1.2GBPS Internet Plan with Xfinity but they say they are working on support for their Gig 2X plan that allows 2GBPS download and 400mbps upload at the moment, but this internet plan is not available yet for 3rd party modems. You have to rent their modem monthly to use the Gig 2X plan right now. They do not have a timeline yet, but I believe that the firmware update from Xfinity will be available VERY soon so that "MidSplit" works with their service. The Arris S33 modem IS compatible with MidSplit...Xfinity just needs to finish testing for third party modems and send a firmware update to existing customers so they can take advantage of the MidSplit feature and get 2GBPS internet without having to rent their shoddy equipment.

ARRIS offers a 2 year limited warranty on new models, 1 year for refurbished products.

was the Mac address release from previous device owner account? What happens if not?

It depends on the backend provisioning system of your internet service provider. Ideally, you should be able to use a used/refurb device provided the service provider's provisioning system automatically removes the previous owner's information from the device

When does the certificate expire?

The DOCSIS certificate. It's rated as 3.1. Comcast is expiring the ones that are 3.0. So I think this one should be good until the next security upgrade in a few years. Hard to say for sure. My Zoom is 3.0 and it was made back in 2014. Only just now being "expired."

ASIN	B098PFNQV3
Best Sellers Rank	#15,202 in Electronics ( See Top 100 in Electronics ) #11 in Modem Router Combos
Brand	ARRIS
Built-In Media	ARRIS Surfboard SBG8300-RB DOCSIS 3.1 Gigabit Cable Modem & AC2350 Dual Band Wi-Fi 5 Router, Approved for Cox, Spectrum, Xfinity & Others (RENEWED)
Color	Black
Compatible Devices	Personal Computer, Smart Television
Connectivity Technology	Ethernet
Customer Reviews	4.1 out of 5 stars 843 Reviews
Data Transfer Rate	1000 Megabits Per Second
Internet Service Provider	Brighthouse, Cablevision, Charter, Comcast, Cox, Mediacomm, Spectrum, Suddenlink, Time Warner, Xfinity
Internet service provider	Brighthouse, Cablevision, Charter, Comcast, Cox, Mediacomm, Spectrum, Suddenlink, Time Warner, Xfinity Internet service provider Brighthouse, Cablevision, Charter, Comcast, Cox, Mediacomm, Spectrum, Suddenlink, Time Warner, Xfinity See more
Item Dimensions L x W x H	11"L x 4"W x 12"H
Item Type Name	Modem Router Combo
Item Weight	2 Pounds
Manufacturer	CommScope
Maximum Downstream Data Transfer Rate	1000 Megabits Per Second
Maximum Upstream Data Transfer Rate	1000 Megabits Per Second
Modem Type	Cable
Number of Ethernet Ports	4
Number of Ports	4
Product Dimensions	11"L x 4"W x 12"H
UPC	612572215531
Warranty Description	1 Year Limited Warranty

ARRIS Surfboard SBG8300-RB DOCSIS 3.1 Gigabit Cable Modem & AC2350 Dual Band Wi-Fi Router, Approved for, Spectrum, Xfinity & Others (RENEWED)

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