User Guide
Page 60
... "Digital Signature Not Found" may appear part way through installation of the USB driver. Note that the USB cable provides data transfer capabilities only. Disconnect the USB cable from the computer over the USB cable. Because of this, the printer needs to have batteries installed or the optionally available AC adaptor connected to...
... "Digital Signature Not Found" may appear part way through installation of the USB driver. Note that the USB cable provides data transfer capabilities only. Disconnect the USB cable from the computer over the USB cable. Because of this, the printer needs to have batteries installed or the optionally available AC adaptor connected to...