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I’m trying to use SMS utilities and send / receive SMS texts. They no longer work. I’m using both an AT&T and Verizon sim, and neither of them work now.

i noticed there is a newer firmware, but no mention of a fix for SMS. Any suggestions?

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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