How to factory reset Arris CM820A router – Default Login & Password

The Arris CM820A router has No WiFi, 1 Gigabit ETH-ports and 0 USB-ports.
It is also known as the Arris Ultra-High Speed Cable Modem.

Arris CM820A default Password , Login & Gateway settings :

If you have performed a reset of your CM820A device or not changed the defaults, you
should
be able to access it with the following settings
Default subnet mask: 255.255.255.0

How to factory reset (hard reset) Arris CM820A :

You can factory reset your Arris CM820A in the following way(s)
1. When the router is on, press the button reset and hold for 30 seconds.
2. While holding down the button reset, turn off the power of the router and hold down the button reset for 30 seconds
3. While holding down the button reset, turn on the power to the unit again and hold for another 30 seconds

Arris CM820A router specifications :

System specs
CPU: n/a
RAM: 128 MiB
Flash: 16 MiB
Custom firmwares: None
Connectivity
WiFi: No ()
WiFi bands
n/a
WiFi throughput: n/a
WAN
None
ETH
1 x Gigabit port
USB-ports: 0
Arris CM820 review (quick overview)
Here is the quick comparison of how the Arris CM820 compares to
other routers on our site
Average
29/100
Editor
80/100
WiFi
2/100
Hardware
7/100
Current price
$22.97
For a full list of routers and how they compare to the CM820A, check the
Router Buying Guide which will help you buy the most
price-competitive router.
CM820A Firmwares
Staying up to date with the latest firmware is a good idea to keep your router even more
secure
from various security flaws.
If you want to squeeze a little bit of extra functionality out of your router, consider
flashing
an open-source firmware like dd-wrt, openWRT or LEDE. Flashing a custom ROM can greatly
increase
the stability and functionality of your old router.
Following are the firmwares that we have identified existing for the Arris CM820A
Arris stock firmware for the CM820A
Stock firmwares for the CM820A are available under the download section on the
modem’s
support page. You can also refer
to the router’s manual for instructions on how to upgrade the firmware.