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    Thread Venue 7840 couldn't connect the internet when first registered after flash OTA

    Hi All, I had updated my 7840 to 5.1 for serval months. Recently, I re-flashed system by using same OTA file. After first reboot, I chose language and regional, then connected to my home WIFI, but I was informed "couldn't connect to the internet" when 7840 try to register, and I couldn't skip...