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."

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🚀 Unlock Gigabit Speeds & WiFi Freedom — Don’t Get Left Behind!

MULTI DEVICE READY - Connect up to 4 wired devices simultaneously with gigabit Ethernet ports for zero lag.
POWERFUL AC 2350 WI FI - Seamlessly stream, game, and work with robust dual-band wireless coverage.
TRUSTED COMPATIBLE - Certified for Comcast Xfinity, Cox, Spectrum & more — join millions upgrading their home network.
BLAZING FAST DOCSIS 3 1 - Experience next-gen internet speeds up to 1 Gbps with cutting-edge cable tech.
SAVE BIG OWN YOUR NETWORK - Cut rental fees and boost your internet ROI by owning your modem-router combo.

The ARRIS SBG8300-RB is a DOCSIS 3.1 cable modem and AC2350 WiFi router combo designed for gigabit internet speeds. Compatible with major US cable providers like Comcast Xfinity, Cox, and Spectrum, it features 4 gigabit Ethernet ports and dual-band WiFi for seamless connectivity. This refurbished powerhouse delivers ultra-fast streaming, gaming, and downloading while helping you save on rental fees.

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Brand	ARRIS
Product Dimensions	7.29 x 20.32 x 23.7 cm; 907.18 g
Item model number	SBG8300
Manufacturer	CommScope
Series	SBG8300-RB REFURBISHED
Colour	Black
Connectivity Type	Wi-Fi
Wireless Type	802.11ac
Number of Ethernet Ports	4
Operating System	Linux
Are Batteries Included	No
Item Weight	907 g
Guaranteed software updates until	unknown

ARRIS (SBG8300-RB) - Cable Modem Router Combo - Fast DOCSIS 3.1 Gigabit & AC2350 WiFi,Comcast Xfinity, Cox, Spectrum & More, 1 Gbps Max Internet Speeds, 4 OFDM Channels - Renewed

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