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Hello,
Could you provide more details about the issue. You have mentioned that SMS utilities no longer work. Have you used it successfully before? If yes, then what changes did you made recently? Also, we always recommend upgrading the firmware version to the latest no matter what. But this time please do it via the bootloader menu. Follow these instructions: https://wiki.teltonika-networks.com/view/RUTXxx_Firmware_via_The_Bootloader_Menu
Regards.