Upgrade LTE Module LTE5398-M904 from USB - possible?

Hi @TurtlePL

Welcome to the forum.

According to the user guide at https://download.zyxel.com/LTE5398-M904/user_guide/LTE5398-M904_EU_1.00_2.00%20Ed2.pdf I do not think that it is possible to upgrade via USB.

I think that you could try to get a USB to Ethernet adapter, so that you can connect by Ethernet.

Or you could try to connect by WiFi to do the upgrade.

The upgrade software files are at https://www.zyxel.com/global/en/support/download?model=lte5398-m904

Kind regards,

Tony