To factory reset a Cisco Catalyst 9200 series switch (e.g. when you can no longer log in or have forgotten the password), you can factory reset the switch through physical access and a serial console connection.
MANUAL_BOOT=yes SWITCH_IGNORE_STARTUP_CFG=1 boot flash:packages.conf
Note that the factory reset is only definitive if you save the now empty configuration once the boot process is completed. If you do not do this, and power cycle the switch, it will reload the original configuration.
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