Monday 19 October 2009

Cisco 877W Factory Reset Password Recovery

Bought a Cisco 877W off eBay, as a reliable router / access point for home. It came configured as a "The Cloud" free WiFi Hotspot.

If you need to do a "factory reset" on one of these you can.
  1. Connect to the console using serial cable.
  2. Switch on while hitting [FN-CTRL-BREAK]- (I have a Thinkpad, [FN] not needed on a desktop keyboard). Tricky, may take a few attempts - need to be hitting it really early on in the boot process.
  3. Get rommon> prompt. [http://www.roadkillnetworks.com/cisco/tftp_rom_monitor_appendc.htm]
  4. >confreg, >yes, >no to everything except "ignore system config info".
  5. >reset
It will then reboot from an alternate configuration file, and you're in! Now however, to clear the existing setup and revert the router to a good state.
  1. Router>enable
  2. Router#conf t
  3. Router(config)config-register 0x2102
  4. Router(config)exit
  5. Router>write memory
  6. Router>reload
Useful guide:
at
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1 comment:

  1. Anonymous8 February 2010 at 10:16

    while in rommon you can also do

    >confreg 0x2142

    This will load it would the startup build. Once in you can write erase or even view the old configs. :)

    ReplyDelete

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