As per the install guide:try to rest one more time: Performing the factory reset Perform the following instructions to use the reset button to do a factory reset. This is applicable from R08.0.70 and later. 1. Remove power from the switch. 2. Press and hold the reset button and apply power to the switch. 3. Release the reset button after all of the system LEDs flash amber. When all the system LEDs blink green, all the configuration data is being erased and the switch is returned to its factory configuration. When all the system LEDs are solid green, the erase process is complete and the system will reload. Once reloaded and the SYST LED is steady green the factory reset is complete.
If it still does not work please open a trouble ticket with the TAC using the following link: