Factory Reset MC9300 with SD card

You’ll need a microSD card for this unless you’ve enabled USB debugging (disabled by default):

Download the factory reset zip file from here: https://www.zebra.com/apps/dlmanager?dlp=-227178c9720c025483893483886ea540bd07dd0f9873752cf891686eb495040ba85f97bf163f9fd12080ee1978f57c98463270ae549b1b51ba0181bc2a6ca21b7bad03c835c5cf90760878bce358dd715b549550bf2400efbbcf475ccabf9cb&c=us&l=en
Copy the factory reset zip file to the root of the microSD card using a PC, then install the microSD card into the MC9300 (the slot is located underneath the keypad).
Power on/restart the device, holding the pistol grip trigger to force it into recovery mode (you can release after the Zebra logo appears on screen).
Navigate to Apply upgrade from the SD card option, hit Select/Enter button
Select the factory reset file then press power.
Reboot device after it returns to the recovery menu and the factory reset should complete.