Haven't noticed there is a way to check that info. Are you sure there is no other person who can control it to turn it on?

Which button is disabled? I never meet this before. Are all the format supported by the router?

US version usually is used for US. I don't think we can flash it with US version. no available C7 V4 KR version to do the test. Generally speaking, it should be supported because that function is a...

Do you mean you even can't detect that wifi or can detect but can't connect to it successfully? except hotspot, it also can't detect any other wifi signals? how about unplug and replug the adapter.

it will work when the router works at 3G/4G router model, the ethernet port works as a LAN port.

Do you mean it won't get hanged if you do not use samsung smart TV? How you connect TV to the router? wired or wirelessly? If it's wireless connection, try to change the wireless channel to a fixed...