User can switch from the Infra mode (connecting to existing known network) to Ad Hoc mode while the unit is powering up.
1.) When the device is booting, it's starting with "Init.." > "Infra.." and when it is at the "Scanning..." stage, please press the power button one time immediately.
2.) When the power button is hit one time, it will display the message "Cancel ?" and press the power button one more time to confirm.
3.) The next screen will show "Canceled" and the device will rescan and go back to Ad Hoc mode as it is illustrated at the image below.