bon les Pokémons......
Voilà comment on fait:
Step-by-Step Procedure
Attach a terminal or PC with terminal emulation to the console port of the router. Use the following terminal settings:
9600 baud rate
No parity
8 data bits
1 stop bit
The required console cable specifications are described in Cabling Guide for RJ-45 Console and AUX Ports (Cisco's 1000 series, 2500 series, and AS5100).
Using the power switch, turn the router off and then turn it back on.
Press Break on the terminal keyboard within 60 seconds of the power-up to put the router into ROMMON.
If the break sequence doesn't work, see Possible Key Combinations for Break Sequence During Password Recovery for other key combinations.
Type set at the boot# prompt and record the current value of the config register (set by the "ios-conf" variable)
boot# set
set baud =9600
set data-bits =8
set parity =none
set stop-bits =1
set console-flags =0
set mac-address =0050.7307.C329
set unit-ip =10.200.40.65
set serv-ip =255.255.255.255
set netmask =255.255.252.0
set gate-ip =10.200.40.1
set pkt-timeout =8
set tftp-timeout =16
set boot-action =flash
set file-name ="c800-oy6-mw.120-5.T"
set watchdog =off
set prompt ="boot"
set ios-conf =0x2102 !-- this is the value to record
Type set ios-conf = 142 at the boot# prompt.
If Flash is intact, the best setting is 142.
If the Flash is not installed or is erased, use the 141 setting. Note: With this setting you can view or erase the configuration, but you cannot change the password.
Type boot at the boot#> prompt to initialize the router.
The router reboots but ignores its saved configuration.
Type no after each setup question or press Ctrl-C to skip the initial setup procedure.
http://www.cisco.com/warp/public/474/pswdrec_800.html
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GUILINUX-HANDOVER