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Reboot gateway once you insert boards.
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Q24,How can i fix system when system was broken?
Please read the manual and operate steps one by one.
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Q25,How can i visit webpage when i forget the ip?
1:You can connect device's Wan port to a router, find the ip via router
2: Gateway's Lan has a reserved ip (192.168.99.1 255.255.255.0), you can visit webpage via this ip.