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Hi, good day
reset configuration and don't put any APN leave it blank, enable auto APN...reboot the device
check GSM signal and SIM status, if there is a good 2G coverage area should get GPRS. if SIM status is ready and the GSM signal is good but didn't get GPRS please put the exact APN.
still have an issue please update the latest firmware or please Create a VIP help desk or contact your sales manager. If you don't have any contacts with our Sales managers, please contact them on our official website https://teltonika-gps.com/ and click on the "Contact Us" button. When you will click, please fill out the form and submit it. Note: as a topic, please choose "Vehicle telematics". Or you can send an e-mail with a description of your situation to info@teltonika. Please follow these recommendations: https://wiki.teltonika-gps.com/view/Recommendations_for_filling_a_query_description
this is fmb920 firmware errata https://wiki.teltonika-gps.com/view/FMB920_firmware_errata