If the Zebra printer is printing "Invalid - C" instead of a barcode, see this article from Zebra:
Getting INVALID-C Instead of Barcodes
We have had success on our Zebra ZP 450 by using Windows to enter the following command:
^XA^CVN^JUS^XZ ! U1 do "device.reset" "" <CR>
That can be done by:
1. Going to Control Panel - Devices and Printers
2. Right Click the Label Printer and select "Printer Preferences."
3. Enter and send the command under Tools as shown:
4. Click Send.
*If the problem reoccurs, see the article about creating an "AUTOEXEC" file on the printer with the following command:
^XA ^DFE:AUTOEXEC.ZPL^FS ^CVN ^XZ
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