Check this topic, if you have the problem of the same LTE firmware: http://forum.mikrotik.com/t/hap-ax-lite-lte-issues-after-modem-fw-upgrade-to-16121-1034-00-01-01-05/173481/32
Check this topic, if you have the problem of the same LTE firmware: http://forum.mikrotik.com/t/hap-ax-lite-lte-issues-after-modem-fw-upgrade-to-16121-1034-00-01-01-05/173481/32