EM7421 firmware upgrade

Hi,

We have bunch of machines with EM7421 modems that sometimes experience mysterious communication breaks for which we have been unable to find any cause.

But looking at modems with ATI-command I get:

Manufacturer: Sierra Wireless, Incorporated
Model: EM7421
Revision: SWI9X50C_01.14.03.00 b06bd3 jenkins 2020/09/23 10:53:35

So the firmware is oldish, making me think about updating it.
It seems that there are versions 1.14.22.00 and 1.14.13.00 available for download.

I had a look at Linux fw-download-tool which is the utility to use here as far as I understand
and the process looks quite straightforward. Anything I should take in account before
updating or shall I just go and do it ?

You can just upgrade the firmware after installing the MBPL USB drive

Drivers in stock Debian are not valid for this ? So drivers from MBPL are required ?

I don’t know, you can give a try