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I used to have a sim card from EE here in the UK. I now bought a new card from O2. I'm changing the APN settings, but every time I press save, when the screen refreshes, the settings change back to the EE ones. I also tried to reset the device, to no avail, and I tried to restore factory settings following the instructions on the modem, but nothing happened, I still have the old settings.

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Please try to reinstall router firmware: https://wiki.teltonika.lt/view/Where_can_I_find_firmwares_for_old_devices%3F

DO NOT keep settings when flashing!