When performing read or write access to the files in or to the printer using PJL files or command, the printer prints garbage or a printout of the job’s commands.
Navigate to Settings > Print > Setup and uncheck the box for "PJL File Access Control", as shown below.
If the issue persists, search for more information related to this issue or contact support for further assistance.
LEGACY ID: SO8895
How to Update Print Server Firmware Using the Web Interface
Steps on how to update the printer firmware via FTP (File Transfer Protocol).