First of all; Is it possible to manually downgrade the firmware, to the 1.1.3 Build?

I can't see nothing about that not being able, unlike in some other cases, on the site:

 

Anyway, since I upgrade the X50-5G, by the app recommendation, I've had the same problem constantly.

The band, even if I select "5G Preferred", even if I lock the Cell, even if I Manually select the Bands; it constantly seems to drop the 5G/4G connection, going as far as selecting the band B8 (that I can't even find it in "Manual Search" of the Bands applied to my Carrier) and being identified as 3G.

I hope this will be resolved by the end of the month, but it will be quite something to see what will be the behavior of the router at 31/08; as my Carrier announced it will "turn off" the 3G at that date.

 

Here's a device directly connected (Ethernet) to the modem/router & its history data of download speed:

Note: The red arrows represent when the band selection was ignored and B8 was automatically selected.

 

Example of X50-5G choosing  "3G, band 8":

Note: Cell Lock was selected; Bands were manually selected to "B1 and NR28"; still those preferences were ignored.

 

This happens even when the other "preferred" bands are available:

 

I've tried with different SIM cards - same result.

I've checked with my ISP - no problems with the antenna.

I can't replicate this behavior on my phone, that uses the same Carrier's SIM card.

 

Here's proof of the last two facts:

The first test was using my phone (mobile data) - Same ISP/Carrier as the SIM card in X50-5G.

The second test was using my WiFi connection to X50-5G.

The third test was after various attempts to reset the band selection; choosing Auto, then Manual selection, until the X50-5G finally connected to the Bands I had manually selected.

 

I've been using the X50-5G, since 20/04/2024, without a problem.

This only began since the upgrade of the firmware with the options to Lock the Cell and manually select the bands became available.

 

A curious fact is that this seems to have been a problem before the 1.1.2 Build:

And, in fact, I had my router to reboot at 4am, every day. The change of the band and selection of 3G would happen at 4:15am.

Unfortunately it even happens without rebooting.

I turned off the schedule reboot and created a python script that checks the "Network Type" the router is using, every 15 min:

At 5:15am, even without a reboot, it changed to 3G and only went back to 5G after the I manually (once again) did search of bands, and so on...