LTE5398-M904 - LTE Module upgrade

Janusz_Nosacz · June 2023

@androll You can try to change IPv4 to IPv4v6 and set the option to save router logs.

If you want to check the logs, you have to click the button to download the file to your computer, because they are not displayed in the router.
There you can check if the router loses its connection forever, or if it can reconnect to the network with a different IP address.

In my case, this exact change caused the connection not to drop.

Link below ;) https://community.zyxel.com/en/discussion/16294/zyxel-lte5398-m904-connected-to-the-cellular-network-but-no-internet-access/p3

BruCom · June 2023

@androll I think you could go back to version 8.

androll · June 2023

https://community.zyxel.com/en/discussion/comment/53574#Comment_53574

Generally router after line drop re-establishes the connection.

The problem occurs only during 3G phone calling.
I digit number, the call starts, after 1 min and 4-5 sec I hear bip sound of line drop, I check inside router web gui and this is the status

Behaviour in internet browsing instead is stable without line drops also for days.

androll · June 2023

https://community.zyxel.com/en/discussion/comment/53576#Comment_53576

Yes but using always netgear software

androll · June 2023

I can try changing in IPv4/IPv6 but I think that module 8 version has unstable behaviour in 3G calling with WINDTRE provider.
In last months this behaviour was randomic, sometimes 2h of phone calling without problems and sometimes few minutes with line drop.
From yesterday it became constant after precise period of conversation

Janusz_Nosacz · June 2023

@androll Ok, thanks for the explanation, I understood that this is unfortunately a different error than the one I encountered.

I have a changelog of module version changes from A11 to A12.
If I had this problem, I would look for a changelog from version A08 to A11 if this error was eliminated and then I would try to update the firmware of the LTE modem.

In the evening I will try to send you this changelog, because it may turn out that this error has been fixed only in version A12, and this one cannot be installed in our router.