The official documentation for this procedure is available at Recover Password for Catalyst Fixed Configuration Switches. What follows below is a condensed version, for our mutual convenience:
Hold down the mode switch while power cycling the unit. Issue the following over the serial terminal (9600 8 N 1) and note that load_helper may not be available on your device:
flash_init
load_helper
rename flash:config.text flash:config.bak
boot
Abort the configuration wizard by specifying n at the prompt:
--- System Configuration Dialog ---
At any point you can enter a question mark '?' for help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.
Continue with configuration dialog? [yes/no]: n
Enter enable mode at the Switch> prompt:
en
!-- Recover the old configuration thus:
rename flash:config.bak flash:config.text
copy flash:config.text system:running-config
!-- Then commit new secrets to the configuration:
configure terminal
enable secret password
enable password password
line vty 0 15
password password
login
line con 0
password password
write memory
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