![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Check the printer firmware.
- If the printer firmware level meets the above requirements (at least FW4), skip Steps3 and 4.
- If there is an SPR (Special Product Request) firmware on the printer, it needs to be at least at the FW 4 level.
- If the printer's SPR firmware is older than FW4, please contact Lexmark Technical Support for further assistance.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Follow the setup guide to position the input tray on the printer. Important!The envelope tray must be in the Tray 3 location.
Note: The tray part number 21K0787 is labeled on its box.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Download the most recent firmware for the printer
Note: Refer to the Drivers & downloads website
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Update the printer firmware by following the steps found in the README_Updating_Firmware document
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Download the tray firmware and load it to the printer by following the procedures found in the README_Updating_Firmware document.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
The envelope tray is now ready to use.
If the issue persists, search for more information related to this issue or contact support for further assistance.