TRB142 serial problem

A brand new TRB142 with latest firmware.TRB1_R_00.07.06.6

I use it for SMS from a computer.

If I set Serial Utilities / Edit / Mode to “Partial Control” the modem continually report
+QCSQ: “LTE”,57,-86,204,-11 (numbers are different every time).
AT+QCSQ=0 dosn’t do anything. Modem seems not to accept AT-commands in Partial Control mode.
If I set mode to “Full Control” modem accepts AT-commands but instead it drops from the mobile network. Signal strength leds on front starta blinking and never show a connection.

Why doesn’t it get a connection to mobile network when in “Full Control” mode?

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