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You can reset your Palo Alto Firewall :  

Steps 1) Connect the Console cable, which is provided by Palo Alto Networks, from the “Console” port to a computer, and use a terminal program (9600,8,n,1) to connect to the Palo Alto Networks device.

NOTE: A USB-to-serial port will have to be used if the computer does not have a 9-pin serial port. 2) Power on to reboot the device. 3) During the boot sequence, the screen should look like this: Screenshot for Welcome to the PanOS Bootloader 1) Type maint to enter maintenance mode. Screenshot of Entry in Bootloader 2) PAN-OS 7.1 NOTE: When performing this on PAN-OS 7.1, you will see a “CHOOSE PANOS” screen with the following options: PANOS (maint-other)PANOS (maint) or PANOS (sysroot0). Please choose PANOS (maint). Press enter to continue. Screenshot of Choose PAN-OS with highlighted PANOS (maint)

 Once in maintenance mode, the following is displayed, please press enter to continue: Screenshot of Welcome to the Maintenance Recovery Tool with Continue highlighted

4) Arrow down to Factory Reset and press Enter to display the menu: Screenshot of Welcome to the Maintenance Recovery Tool with Factory Reset highlighted 5)

You will see the Image that will be used to perform the factory reset. Select Factory Reset and press Enter again: Screenshot of Factory Reset page                      
6) The unit will reboot when complete.

Please be aware that it may take several minutes before the autocommit to complete and low the admin/admin login to work properly.
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