Comments
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i would suggest to check if Apple devices iOS versions have all been update to date. then, check with ISP if the modem is update to latest software version. hope it helps.
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I would suggest you to check with ISP firstlly to see if your modem is getting 500Mbps on WAN side. Also, if you are testing speed, make sure you do not have other traffic transferring data (such as bittorrent) at the time you are running speed test.
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you can check if there is sticker on the belly label shows the login info. If not, then you might need to check with your ISP for login info.