Re: ZTE ZXDSL 831 AII modem stopped working on BSNL broadband connection
It is really useless updating the Firmware for your modem because no improvement is expected by doing it. You should go to your nearest Exchange and ask them to reset it back to original factory setting.actually error 678 is Id password problem as you are using Dialer.You can use reset button on modem and again try Dialer. If your reset button is not working so inform to the BSNL customer care and they will replace it.
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