Cisco Valet Plus M20

bgn (N300)
802.11b/g/n Gigabit Wireless HotSpot Router
Support	Support page
Wikipedia	Cisco Systems
InfoDepot Wiki	Cisco Valet-Plus M20 v1.0
3rd Party Firmware
dd-wrt	Supported
OpenWrt	Incompatible
Tomato any flavor	Supported
Gargoyle	Status Unknown
Platform
Brand • Model • Rev	Cisco M20
Serial number prefix	CVJ0
FCC ID	Q87-M20
IC ID	3839A-M20
Type	wireless router
CPU1	Broadcom BCM4716B0
CPU1 Type	MIPS 74K
CPU1 Speed	300 MHz
Flash1 Chip	Brand? Model?
Flash1 Size	4 MiB4,194,304 B <br />32,768 Kib <br />4,096 KiB <br />32 Mib <br />0.00391 GiB <br /> (Serial)
RAM1 Size	32 MiB33,554,432 B <br />262,144 Kib <br />32,768 KiB <br />256 Mib <br />0.0313 GiB <br />
RAM1 Chip	SK hynix HY5DU561622FTP-D43
ETH chip1	Broadcom BCM4716B0
Switch	Broadcom BCM53115
Ethernet Port Count	1-1GbE-WAN 4-1GbE-LAN
Wired Standard	IEEE 802.3/3u/3ab
802dot11 OUI: 68:7F:74 (13 E, 16 W) Ethernet OUI: 68:7F:74 (13 E, 16 W)
Expansion IF types	none specified
Power	12 VDC, 1 A
Connector type	barrel
Serial Port (UART)	yes
JTAG Port	yes
Other
Default SSID: CiscoXXXXX (6 addl. devices) Default IP address: 192.168.1.1 the IP 192.168.1.1 is used by 1324 additional devices of which 18 are Cisco devices Default login user: admin Default login password: admin admin:admin credentials used by 1342 additional devices of which 13 are Cisco devices
Manuf/OEM/ODM	CyberTAN
3rd Party Firmware Support	DD-WRT • (List) , TomatoUSB • (List | DLs)
Retail
Availability	common
FCC approval date	25 January 2010
(Est.) release date	31 March 2010
UPC	745883589388 (UPC DB, On eBay)
Newegg	N82E16833186011
ASIN	B003B4AVSS
Country of manuf	China
Physical
Dimensions	7.95" x 6.30" x 1.34"
Radio 1
Chip1	Broadcom BCM4716B0
Wireless interface OUI	68:7F:74
Antenna Connector Type	Internal
MIMO status	2x2:2
Wireless Standard	IEEE 802.11b/g/n
802.11n	up to 300 Mbps
802.11g	up to 54 Mbps
802.11b	up to 11 Mbps
WiFi Operating Frequency	2.4 GHz
Radio cor_rev	17

For a list of all currently documented Broadcom chipsets with specifications, see Broadcom.

For a list of all currently documented Cisco device with specifications, see Cisco.

• 300 Mbps - 2SS 2.4GHz 802.11n (40MHz chan.) = N300 class

Overview

The M20 shares the same hardware as the Linksys WRT310N v2.

To get HT40 support in the 17804 build, telnet into the router and run the following commands..

nvram set wl0_nbw_cap=1
nvram set wl1_nbw_cap=1
nvram commit
reboot

While the device is not listed on the support list, it works with TomatoUSB (K2.6 NoUSB-STD) as of 10/13/2011.

"3763-02010206R" is silkscreened on the board in the FCC photos.

M20 serial numbers appear to start with CVK0.

The default SSID is CiscoXXXXX where XXXXX is the last 5 digits of the serial number. If the device has been configured with Cisco Connect the device will probably have a randomly generated SSID. A sample serial number is CVK01K427671

The included power adapter is a Bestec EA0121WAA.

Links of Interest

Cisco Valet Routers on Wikipedia
On the DD-WRT wiki (listed as a WiP)
On thread of many on the DD-WRT forums, pointing to Eko's recent builds as supporting the M20, as of 09/08/2011 the latest build is 17804

Flashing

Flashing dd-wrt

Supported by dd-wrt as of = svn14471 WIP

Please insert instructions here

Flashing Tomato

Please insert instructions here

Upgrading

Updating DD-WRT

If dd-wrt is already on the router follow these instructions. If stock firmware is on the router follow the flashing instructions.

1. Check for recommended builds here first.
2. Set your computer to a static IP of 192.168.1.7. (or to whatever subnet the router is on) Disable all firewalls and security. Disable wireless on your computer and only have the router connected to the flashing computer by the ethernet cable between the two.
3. Hard reset or 30/30/30 (If the router supports it, if not, reset to defults in the GUI) prior to flashing. Wait. Check for password page on re-login and change password.
4. Flash firmware. You can use the webgui except if you have a belkin router. (For belkin use tftp.exe to flash)
5. Wait...at least three minutes. Lights should return to normal. See important2, below. Failing to wait is how most people brick their routers.
6. Do a power cycle of the router. (Unplug the cord, count to 30 and plug it back in.)
7. Wait for the lights to return to normal usually about 2 minutes.
8. Hard reset or 30/30/30 again (If the router supports it, if not, reset to defults in the GUI). Wait. Check for the password page and re-login to change the password. Then you can reconfigure your settings manually.
9. Once configured set your computer back to autoIP and autoDNS.
   

Important1: This Hard reset or 30/30/30 works fine for Asus router, but you do have to power cycle after the reset.

Important2: After you flash the firmware, and before you do the hard reset, the router will be building some nvram settings. YOU MUST WAIT FOR THIS TO FINISH PRIOR TO DOING ANYTHING WITH THE ROUTER INCLUDING A HARD RESET. Usually, you can tell when this process is completed by the WAN light coming on, but it does take several minutes. Go have a beer. There are starting to be more and more people who BRICK their routers by not waiting until the nvram is rebuilt, PRIOR to doing a hard reset. YOU NEED TO WAIT!

Reverting

• Support Thread On the DD-WRT Forum

JTAG-Serial Info

Serial

Serial Pinouts

VCC  1 o
 TX  2 o
 RX  3 o
N/C  4 o
GND  5 o

Pictures

FCCID Q87-M20

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