You must enable logging of a lte topic to see all events.
Good idea is update a RouterOS and MODEM itself, he have got own separate firmware update.
# Check your and latest firmware version
/interface lte firmware-upgrade lte1
# Do upgrade by:
/interface lte firmware-upgrade lte1 upgrade=yes
and
/system logging action remove [find where name=support]
/system logging action add name=support target=memory memory-lines=16384
/system logging remove [find where topics~"lte"]
/system logging add action=support topics=lte
Best Regards SiB
MTCNA + MTCRE + MTCINE | ~800 users at ~150 RouterBoards in EMEA
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