EM7455 doens't use 4g lte


#1

hi guys hope you can help me out
The module/sim combination is only using 3g umts/hspa instead of 4g lte.
I would love to use te 4g.

I recently installed an em7455 module in a lenovo t470. installed the simcard in de sim slot. Then I installed the drivers from the lenovo site. All went well and the adapter en connection came up. Hurray!
But after doing speedtest a realized that the adapter/sim was only using 3g.

I then went on to look for an option to force 4g. I could not find any setting like that in windows 10 / the adapter settings / or whatsoever. So I thought maybe a firmware problem. I downloaded the latest firmware from the sierra site. Alas still no 4g.
Then I got the latest airprime generic driver 4836 and installed it (after removing the old drivers). Still no 4g.
Then I saw the Skylight tool, in which i can see the status and signal strenght but no option to force 4g.

Is there anyone out there with similar problems or know solutions?

Thanks in advance,
Roland


#2

You can open AT port by TeraTerm tools or any other tools and check the response of AT!SELRAT? or force it to select 4G only.
AT command guide for reference:
https://source.sierrawireless.com/resources/airprime/minicard/74xx/4117727-airprime-em74xx-mc74xx-at-command-reference/