Invalid-C on FedEx Label



If you are trying to print FedEx labels for international shipments and the 2nd label prints "Invalid-C" where the waybill barcode should be, your printer cannot handle the details that are in the barcode that is trying to print. This generally indicates that the firmware on the printer is outdated, and should be updated to the newest version.
 
To find the updated version of firmware for the printer:

  1. Go to zebra.com, and search for your printer model (i.e. GK420D)
  2. Select the matching result from the results screen
  3. On the printer details page, click the Firmware tab just below the printer description
  4. Download the ZDownloader tool. This tool installs the firmware downloaded in the next step
  5. Download the latest firmware version (should be just above the ZDownloader link)
  6. Run ZDownloader
  7. Click the Auto-Detect Printers button to find the printer on the station. Once found, select it
  8. Right-click the printer from step 7, and click "Select Firmware File"
  9. Once selected, the file should automatically be downloaded to the printer. If you have a screen on your printer, you should see it flash and indicate it is downloading the firmware.
 
NOTE: If you are using a carrier provided printer, the directions above may differ for you. In that case, we recommend contacting the carrier's IT directly and work through the process with them.