Modem stopped working out of the blue

[Martin]

On 2023-07-18 21:10, Martin wrote:
> my modem used to work until recently, but suddenly (and without any
> software update, at least intentionally), I get:

Maybe I've been bitten by an autoupgrade mechanism on that system.
modemmanager, libqmi and other packages *have* been upgraded, e.g.:

modemmanager from  1.14.12-0.2 to 1.20.0-1~bpo11+1
libqmi from 1.26.10-0.1 to 1.32.0-1~bpo11+1

Downgrading to the older versions solved the problem immediately.

Cheers