You may need administrative rights to access the application.
Open a Web browser, and then type the printer IP address in the address field.
Click Apps > QR Code Generator > Configure.
Do either of the following:
Apply the changes.
Unable to downgrade code; Green Micro
An "Invalid Engine Code" Error is Appearing on a Lexmark T64x Series (T640, T642, T644) or an X64xe Series Printer