Hi,
I know the Make & Model of the Modem, its a "DW5811e Snapdragon™ X7 LTE", also often referred to as a "EM7455B" made by "Sierra Wireless, Incorporated". I should maybe add that we are NOT talking about a USB Dongle type device, but rather an internal module mounted inside a Laptop.
This is about what it looks like (picture stolen from the web)
When you say "USB Wifi Dongle" I guess you mean an External USB 4G Modem dongle, also sometimes referred to as "Surfstick" or something similar, that's not a route I want to go though, since I specifically bought this laptop for the internal LTE Modem. I think a USB dongle sticking out from the side is an accident waiting to happen.
I could imagine swapping the modem to something that definitely works with Ubuntu/Zorin, if it is not too expensive. I'd have to be sure though, before i order anything.
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Very good point.
Yes, it does. So much for "probably something simple..." I guess there always has to be an outlier...
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Actually it should be in the Hardware help category.
I moved the thread.
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I've tried that, i can't seam to set the "FASTENUMEN" setting to "0":
AT!CUSTOM?
!CUSTOM:
GPSENABLE 0x04
GPSSEL 0x01
IPV6ENABLE 0x01
SIMLPM 0x01
AT!ENTERCND="A710"
OK
AT!CUSTOM="FASTENUMEN",0
OK
AT!CUSTOM?
!CUSTOM:
GPSENABLE 0x04
GPSSEL 0x01
IPV6ENABLE 0x01
SIMLPM 0x01
USBSERIALENABLE 0x01
SINGLEAPNSWITCH 0x01
OK
AT!RESET
OK
Also to be completely honest i don't really feel comfortable setting things i don't really understand. From what i understand, since the command AT!PCINFO? outputs
State: Online
LPM voters - Temp:0, Volt:0, User:0, W_DISABLE:0, IMSWITCH:0, BIOS:0, LWM2M:0, OMADM:0, FOTA:0
LPM persistence - None
and not State: Low Power Mode, The Modem is probably NOT in "Airplane Mode", and therefore all of this should not be needed in my case, could be completely wrong though!
If anyone understand this better then i do, please let me know!
@Aravisian might have some idea.
As far as I understand this fix, i'd need to edit a driver and recompile the kernal? Thats a bit too far out of my comfort zone. Also this post is 4 years old, i'd assume the change would have already made it into the release of my version of ZorinOS?
Hope i am not making a fool out of myself, but as i said, i am kind of new to this whole thing...
We need a second opinion.
Hopefully @Aravisian will be coming back here soon.
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The first link does not require messing with the kernel.
It's pretty straightforward - a series of configuration steps. But since I do not have this device, I cannot test it to see if it works.
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You mean the Solution with the AT commands? Yeah, i tried that, step by step, see this post, didn't work for me 
Whenever i send to command AT!CUSTOM="FASTENUMEN",0i get the nessesery OK back, but when i check back with AT!CUSTOM?, it was not actually set.
USBSERIALENABLE 0x01
SINGLEAPNSWITCH 0x01
Are the only settings that changed.
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Ok...
I am not very sure on this...
I could not find much available data. But... I got into one of my Bonehead Stubborn modes...
And began sifting through the drivers in the 5.11 kernel and the 5.8 kernel.
I could Be Wrong
But it looks like the 5.8 modules extra contains drivers that should allow this to work while the 5.11 does not.
It's harmless to try and worth trying so...
Let's rock.
sudo apt install linux-headers-5.8.0-63-generic linux-modules-5.8.0-63-generic linux-modules-extra-5.8.0-63-generic linux-image-5.8.0-63-generic
Once installed, reboot. begin tapping the esc key as you reach the Grub Menu to see Advanced Options for Zorin
Select that and then arrow key to the 5.8 kernel and select to boot from that.
Then test... If it works, we can set your machine to not auto-upgrade to the later 5.11 kernel.
If it does not work, your next reboot will put you back on the 5.11 kernel and we can remove the 5.8.
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Managed to install and boot into the mentioned kernal, unfortunatly still no success
First i made sure I actually booted into the right kernal:
daniel@daniel-Latitude-7370:~$ uname -r
5.8.0-63-generic
Then i tried to connect as per usual
daniel@daniel-Latitude-7370:~$ nmcli c up Vodafone\ Default
Error: Connection activation failed: Network registration timed out
Hint: use 'journalctl -xe NM_CONNECTION=0040cbac-32cd-4925-b30a-b1b7aab851cc + NM_DEVICE=cdc-wdm6' to get more details.
Didn't work, the log shows the same problem as before:
Nov 19 11:25:20 daniel-Latitude-7370 NetworkManager[962]: <info> [1637317520.8442] device (cdc-wdm6): Activation: starting connection 'Vodafone Default' (0040cbac-32cd-4925-b30a-b1b7aab851cc)
Nov 19 11:25:20 daniel-Latitude-7370 NetworkManager[962]: <info> [1637317520.8444] device (cdc-wdm6): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Nov 19 11:26:21 daniel-Latitude-7370 NetworkManager[962]: <warn> [1637317581.3240] modem-broadband[cdc-wdm6]: failed to connect modem: Network timeout
Nov 19 11:26:21 daniel-Latitude-7370 NetworkManager[962]: <info> [1637317581.3241] device (cdc-wdm6): state change: prepare -> failed (reason 'gsm-registration-timeout', sys-iface-state: 'managed')
Nov 19 11:26:21 daniel-Latitude-7370 NetworkManager[962]: <warn> [1637317581.3319] device (cdc-wdm6): Activation: failed for connection 'Vodafone Default'
Nov 19 11:26:21 daniel-Latitude-7370 NetworkManager[962]: <info> [1637317581.3341] device (cdc-wdm6): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
For good measure i tried to connect using mmcli, also unchanged behaviour:
daniel@daniel-Latitude-7370:~$ sudo mmcli -m 0 --simple-connect="apn=web.vodafone.de" -v
[sudo] password for daniel:
[19 Nov 2021, 11:29:53] [Debug] Forcing request to be run asynchronously
[19 Nov 2021, 11:29:53] [Debug] Assuming '0' is the modem index
[19 Nov 2021, 11:29:53] [Debug] ModemManager process found at ':1.16'
[19 Nov 2021, 11:29:53] [Debug] Modem found at '/org/freedesktop/ModemManager1/Modem/0'
[19 Nov 2021, 11:29:53] [Debug] Asynchronously connecting the modem...
error: couldn't connect the modem: 'Timeout was reached'
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Here is my USB 4G modem.
I only use it when I am at a summer cottage of my mother-in-law where no internet exists.
I use it with a USB extension which has come with an old Logitech mouse.
I have never experienced a single accident with this configulation.
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Thanks for the hint, but thats really not a viable solution for me. This is a Laptop i am taking basically everywhere and i don't want to carry or use a USB Dongle. It really HAS to be completely internal.
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I just double-checked and everything shows that the support should be in that kernel.
What is the output of sudo nano /etc/modprobe.d/blacklist.conf
Also
sudo nano /etc/NetworkManager/NetworkManager.conf
Honestly, i've given up on that Modem now. Just went out and bought a used one form German "craigslist" for 20€ and installed it. Worked right out of the box.
I am willing to put the other one back in if you want to try and get it to work with me for the sake of the community, but i personally am done with it
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meh... If anyone needs to get that thing working, we will just cross that bridge when we come to it. I think you've suffered enough.
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If 20 Euro can spare you from a headache, it is the best solution.
From my system integration experience since 1990's, I found the hardware solution is way simpler than the software solution. (That explains why I now own a huge collection of network cards and USB dongles).
And remember, there are some hardware which never work with Linux since majority of them were only tested with Windows.
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Still very thankful for your support! 
Now i'll try to put the rouge Wifi Card in my Company laptop thats running windows 10, lets see if that works
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