Here’s the procedure to set a CK65 back to the initial shipping from factory state.
Restart the CK65 by holding down the power button and selecting Restart from the pop up menu.
When the Honeywell splash screen appears, press and hold the green button and hold down the power button. Release these keys when the Restart Boot Loader screen appears.
Press the green button until the Full Factory Reset screen appears, then press the power button.
The CK65 will erase all data and do a Factory Reset.