Wireless Joint

That's meant to be changed by AT command not by the raw filesystem, if you are going to edit anything in there you should make a full backup first so you can recover it if it gets borked.
If you have the ADB port then you have the modem port also, you should use it instead, imo
there is a lot on ...

ALL THE OLD BUILDS ON THIS DEVICE HAVE LOCKED OUT APN, THE NEWEST BUILD HAS IT UNLOCKED BUT THE PROBLEM
IS AFTER YOU FLASH YOUR DEVICE YOU WON'T GET THE NEW BUILD AND MAYBE NOT EVEN IF YOU DONT FLASH IT.
ANYWAY, I MADE AN APN UNLOCK TOOL YESTERDAY WHICH I AM GIVING TO THE COMMUNITY TO USE TO FIX ...

To assist our members with updating the firmware and/or repairing the IMEI on the EM9191 and EM9190, I put together a kit to help simplify the process.

The kit contains a script along with a collection of the firmware it uses. As with any information on this forum, use at your own risk.

Download ...

here is a stock config from it, not convinced it will do what you want it to but here it is.
If you take this file please don't forget to hit thank you

Netgear LM1200
A quectel modem with a qualcomm MDM9607 chip

IMEI, bands, MEID, pESN, FID and TTL are mod-able on it once you have root
it is de/re-brandable and pretty much anything can be modded that it does.
it has an android/linux os on one side and os2 on a triple stacked ubi over ubifs over ...

Here are some listed in the modem partition and the system partitions of the firmware, I am sure there are prob more but I do not have time to search them right now.
Some of those will be proprietary and require some credentials or have to be in a different mode to work, or at least
thats how they ...

In case you can use it, here is the AT Command Reference Guide for the USB730l.

I know there are sometimes risks if you use the wrong AT command, but hopefully, this might still help.

Here to the O.P. here, the correct drivers packed into a nice factory installer for you.