Support for AT&T/Netgear Aircard 340U?

It’s not currently listed in the compatible hardware post. But I’ve seen some postings that the Aircard 320 works. Anyone know if there will be support for the AT&T/Netgear Aircard 340U? I tried upgrading the firmware to the latest version 01.13.12.13, but my 951G-2HnD still doesn’t see it. USB Aircard 340U powers on, but nothing in the log file and no new LTE interface shows up. Any suggestions?

A little thread necromancy here - I’m completely new to the LTE modem side of Mikrotik, and I’m working with a pair of USB modems.

One I’ve gotten working as a ppp interface (which is my understanding that the ppp interface is not LTE, thus much slower)

The other is this AT&T 340u

I’ve seen several references to “web interface” access on these modems, but only on the Mikrotik forums… how does one access the modem with a web browser?
Has anyone gotten the 340u working with AT&T in ppp mode? (I think this modem might not be possible, as it shows zero ports detected)