Certainly the Cisco 3550 and probably other Cisco IOS devices don't have the option to change the configuration register from the default. Now my C3550s have a value of 0x10F. This is different from your average, and the well-drummed-into-you-from-the-CCNA-to-CCNP, router and switch. This makes it difficult to understand why you can't issue the config-register command at any point while messing with you lab or production device.
I had a bit of trouble finding this out via the DocCD i.e. Cisco's on-line version of it that is now a CCIE must-have here:
http://www.cisco.com/cisco/web/psa/default.html?mode=prod
and ended back with Google and found this reference:
http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration_example09186a0080169623.shtml#concept5
So, you can't edit it and you can't use it to password recover. To do that you need to clear the systems files by reloading the unit by holding down one of the buttons on the front of the device and getting into the initial system configuration and changing name of the config.txt to config.old and re-loading the whole thing once the passwords have been reset. It's a little more involved than that but it'll get you there if you follow Cisco's advice here:
http://www.cisco.com/en/US/products/hw/switches/ps628/products_password_recovery09186a0080094184.shtml
So, that's done now. Time to move on.
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