Password Recovery Procedure for the Catalyst For 2900XL, 3500XL, 2940, 2950, 2960, 2970, 3550, 3560, and 3750 series switches (deleting configuration)
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Step 1: Hold the MODE button on the switch while powering on the switch
Step 2: Hold until the light on Port 1 Goes off
Step 3: From the ROM menu type: flash_init
Step 4: From the ROM menu type: load_helper
Step 5: From the ROM menu type: delete flash:/config.text
Step 6: From the ROM menu type: boot
Step 7: After successfully booting up you can delete the configuration with the following 2 commands:
en
write erase