GL E750V2 - No Internet
Developed a 'no internet' issue after it was turned off for a few hours.
I have already wasted several hours trying to rectify the issue:
Reset fw more than once
Tried manually different upgrading fw, including legacy.
I am about to throw this trash in the bin. Easily the most useless device I've purchased in the past 10 years.
UPDATE:
Issue resolved after updating from a "legacy" version of the fw to the oldest available "stable"
Can the sim card dial properly?
Yes. The sim card is fine.
I'd like to know how this happened, considering no settings were changed by me in the time the device was turned off.
Do you have a picture?
Nothing. I don't know what happened
I did not take a picture. It simply had the "No Internet" message under the name of the service provider. I've seen the message before but this time it was there for hours after I restarted the device.
I had already used the 'WAN' setting fix as advised by members of this forum.
There are many reasons why there is no Internet
Can you share the device so I can check it remotely?
Technical Support via GoodCloud.tar (192 KB)
Does the router really have no Internet or just display that message? If this happens pls get the log. Thanks.
I tried to use it again today and it seems the issue is not resolved. Something about powering off the device and leaving it off for hours (or days) seems to reset it to a stupid, useless state.
The last time I could at least get other devices to see the network. This time around even that is too much to ask for.
Whoever created the fw does not know what they are doing. This is either a completely useless device or a malicious one. Powering off a device should not be grounds for it become defective.
I apprecaite that if you can give some detailed info e.g. images and logs.
Recurring problem with this PoS. Thought I'd give in another try only to waste more time attempting to fix someone else's shoddy work.
I have tried to get it to work with three different networks, all of which work on other devices.
I have hard reset the device.
I have reset the firmware.
The APNs have been manually set.
All to no avail.
Below I will post the logs.
system:
kernel:
Hello. Logs posted.
The annoying "No Internet" message is once again prominent on this POS GL.INet GL-E750V device.
I have tried to get it to work with three different networks, both of which work on other devices.
I have hard reset the device.
I have reset the firmware.
All to no avail.
Below I will post the logs.
system:
kernel:
Was finally able to get some use of this device after reinstalling legacy firmware and updating only for the box of excrement to revert to its default, unusable state after turning it off for a few hours.
Currently unable to even connect to the device to change settings. Whoever is responsible for the firmware is highly incompetent. Dreadfully so.
Anyone looking for a travel router should look elsewhere.
You are angry because of a UI message?
Ehm, ok.
Do you understand where this message came from? It's from the interface tracking. So if the ping / dns lookup needed for that, fails, you will get this message.
Just disable interface tracking then: Multi-WAN - GL.iNet Router Docs 4
Incompetence is angering. If I pay for hardware I expect it to work as advertised.
If it does not why would I be happpy about that?
I have already disabled interface tracking. That is not the issue.
Could you please share technical information then?
See: How to get support quickly
Does the device work (except this annoying message)?
Did you modify any settings via SSH or luci?
Which router (which model?) are you using?
GL-E750V
Which firmware version is in use?
319release3
How is your router connected to the Internet?
No
By cable via the router of your Internet provider? (If yes, which router and which ISP?)
^
Via WLAN? (If yes, which network and which encryption?)
^
By cell phone? (If yes, which mobile provider?)
^
Which DNS server do you use? (The local one of your ISP? AdGuard Home? Another one?)
Mullvad or Google
Do you use DHCP or static IP addresses?
Static
You are not connected to the internet and complain about the message that the internet can't be reached? 
There is a sim card in the device that works elsewhere.
You seem eager to shift the blame to the user when anyone viewing these forums can see that this device is a disgrace.
Please provide the requested information, or nobody is able to help you.
If you just want to shout out that the device is "shit", feel free to do so - won't solve your issue.
When this piece of garbage works it does so via a mobile network. One of three.
Why it suddenly stops working is the issue.
I did post logs for anyone genuinely interested in helping me to fix this most annoying of bugs/features.