By default, a voucher issued by the device contains the 'Hotspot' header image and the logo "Powered by LANCOM". You can disable these graphics directly in the device with the option Print header and company emblem. There is no need to use a customized voucher template to remove these graphics. Using this option outputs a voucher containing neutral text only.
To decide whether the device shows a header image and logo when you create a voucher, go to the dialog and adjust the setting Print header and company emblem.