Answered elsewhere on 7th September, that there is NO firmware available for this "New" etrex 221x.
The link to this China specific etrex does not mention JNX but I'm reading a translated page ?
Etrex221xCHN jnx
who can share the firmware?
There is no update available ,If you have the device you can download the firmware update yourself when it is available.
Does the machine support jnx?
[Only registered and activated users can see links. ]


The DriveSmart 65 I got April 2019 arrived with 3.50 is your HWID 3065 if not what is it.

<PartNumber>006-B3065-00</PartNumber>
<SoftwareVersion>350</SoftwareVersion>
<Description>Garmin DriveSmart 65</Description>