Like all of the Joey line of cart readers from BennVenn, the JoeyLynx has upgradeable firmware. The upgrade process is straight forward but requires that you do it on a Windows computer. Download the latest firmware from the support page here - JoeyLynx, then follow these steps.
Plug your JoeyLynx in using a USB-C cable. It should come up as a new external drive called "BennVenn". Double-click to open the drive that the JoeyLynx shows up as, (F) in the screenshot below.
Find the file named MODE.TXT on the drive and open it in a text editor like Notepad.
Delete whatever the text there is in the file when it opens and type in UPDATE, then save the file. This will cause the JoeyLynx to reset so you will see it disconnect and reconnect to your computer.
Unzip the downloaded firmware and open the folder it's in. There will be a file named FIRMWARE.JR, copy/overwrite/replace this file to the one on the JoeyLynx.
The JoeyLynx will update and will reset. You can then open the DEBUG.TXT file on it to check the version of the firmware, you should see the version number to which you upgraded to.