GDBus.Error Modem in Disabled State. Need help with setting up a USB modem.

[nobody96]

Hello.

Relative newbie here. So brace yourselves, doublefold. I purchased three ZTE MF667 3g+ modems, to use, hopefully to connect to three at once ( no load balancing, just to connect and bridge to VMs ).
I can't get it to work. Modem works on windows 10, using the configuration/dialup software included with the driver. But software locks me to one modem at once, so I hoped Linux would be superior in that regard.
On Linux, when the modem with a sim card is connected, the LED changes from red, to green, to blue ( as it should, indicating modeswitch? ), and it appears that the modem is somewhat recognized and pseudo working. Note:The it still works in storage capacity, and I can access the auto mounted ISO?CD? driver setup. Unmounting/disconnecting the drive disconnect's it, but doesn't seem to do anything to make the modem behave any differently
It appears in mobile networks. But when I enable network connection, and set up APN, the status connection icon in upper right corner glitches and flashes from 3 dots ( connecting ), to bars ( connected ). Really high frequency of flashing.
I figured out, that I can enable PIN sim card locking from mobile networks menu, and it works.
When I press network-type of network, and attempt to change it from "auto" to "manual", error pops up.

"

GDBus.Error:org.freedesktop.ModemManager1.Error.Core.WrongState: modem in disabled state

"

( online searches for that exact error give 0 results )

Qualcomm chipset is recognized in modem information. Power strenght appears as 0%.

Modem appears at /dev/cdc-wdm2 , and in Ubuntu modem connection step by step modem thingy ( as cdc-wdm2 ) in network configuration. When it's set up, nothing happens connection wise, but when the priority on the connection is set to "0", system glitches out, and I can move the mouse, but can't click anything.
Usually it goes away if I unplug the modem from USB. Sometimes I have to reset the PC.

Modem appears as wwan0 also. In some places at least. It's not in any fold down menus for creating an ethernet connection. One guy on his forum said, that this modem works like that. It first appears as an ethernet connection, you connect to it,access modem settings via IPV4 in browser, and configure it there ( https://www.lourdas.eu/blog/zte-mf66...odem-and-linux )

"Ip a"

spews out:

wwan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 9e:73:xx:xx:xx:00  brd ff:ff:ff:ff:ff:ff

( normal MAC, I just censored it )

When I "

Ifconfig wwan0 up

" it, it appears like so in "

ip a

"

wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ether 9e:73:xx:xx:xx:00brd ff:ff:ff:ff:ff:ff
    inet6 fe80::9c73:xxxx:xxxx:xxxx/64 scope link 
       valid_lft forever preferred_lft forever

IPV6 can be pinged, without problems.
I can occasionally assign an IPV4 to it, ( I can assign 192.168.0.100 to it via terminal for example, and sometimes it shows as 192.168.0.40 wwan0 in "netstat -r", but can be pinged only at 192.168.0.100" ). Although I don't know why it sometimes works, and sometimes doesn't.

Can't access it via IPV4 via browser. I get an instant "CONNECTION_REFUSED".

"

mmcli -m any -e

" spews out:

error:  couldn't enable the modem:  'GDBus.Error:org.freedesktop.libqmi.Error.Protocol.MissingArgument:  Couldn't register for power indications: QMI protocol error (17):  'MissingArgument'

lsusb

shows it as

Bus 005 Device 003: ID 19d2:0017 ZTE WCDMA Technologies MSM MF669

So, at this point, I'm dazed, bamboozled, and confused. Especially as a newbie.
Help would be appreciated.
I will answer questions as best as I can.

Thanks.