Password recovery on a 9300 series switch may be required if you have lost the local username/password or the enable secret for the device and there is no AAA authentication in place.
In this situation you can simply use the following process to gain access to the switch and reset the lost passwords. This process is the same for the 9200 and 3850 series switches.
Step 1. Connect to the switch using a console session
Step 2. Power down the switch by pulling the power cable out from the back
Step 3. Plug the power cable back in, as soon as the System LED blinks, press and release the Mode button 2-3 times, alternatively while connecting the power cable continuously press the “Mode” button repeatedly until the prompt displays “switch”
Step 4. At the prompt type:
And then reboot the switch
Step 5. Once the switch reboots, copy the startup-config into the running-config
Switch# copy startup-config running-config
Step 6. Reset the lost passwords or create a new user account
XYZ-Switch# conf t
XYZ-Switch(config)# username admin privilege 15 secret Cisco123
XYZ-Switch(config)# enable secret Cisco321
Step 7. Remove the boot variables back to default for the boot loader process
#XYZ-Switch(config)# no system ignore startupconfig switch all
Step 8. Save the new configuration
XYZ-Switch# copy running-config startup-config
Step 9. Reboot and test the switch to ensure the boot method is back to default and the new passwords are working.