RUT955 lost Mobile network after FW RUT9_R_00.07.01.1. Tested this with another similar RUT955 and same thing.
Up to RUT9_R_00.07.00.2, RUT955 was working normally and was able to connect to cellular network using SIM1.
After update modem status was following (RUT955_Mobile_Status_before_Power_cycle.jpg). Previously working modem was not able to see SIM1 and not able to connect to network. Neither mobile network LED's are illuminated any more.
Reset and reboot with taking power supply off, resulted that in next boot whole mobile network section was missing from UI and of course no Internet access with mobile network.
Downgrading to RUT9_R_00.07.00.2 resulted that Modem was back to UI and connectivity was re-enabled.
Just wondering that what is going on with Teltonika and did they even tested this version with RUT955.