wired readyshare

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Can't turn off readyshare on my Nighthawk AC1900 WIFI Cable Modem Router

The network map shows there is a wired computer as readyshare connected to the router. I just let my own devices to connect to the internet and no other device is allowed but it seems this wired readyshare is allowed. I cannot find anything in the router settings to disable readyshare and can't uncheck the "basic" mode.  Any ideas on how to resolve this issue????

[FURRYe38]

Can you post a screen capture of this Readyshare page on the modem? 

Try a factory reset and setup from scratch with a wired PC and web browser. 

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This is the screenshot from the attached devices.

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 There were many other posts (for example: "Unknown device connected to wifi" from 2018; "N600 Model C3700 ReadyShare - Does is show on my network as a linex computer? from 2018; " C3700-100NAS ReadyShare - Disable This Feature" from 2020) related to this issue. Apparently there is no a clear solution suggested. 

[FURRYe38]

Are there any options on the ReadyShare page on the modem that you can select or this just shows whats connected? 

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Only shows "Basic" chosen.

I  also tried the suggestion given in the post  (C3700-100NAS ReadyShare - Disable This Feature" from 2020). Initially it disappeared from the list but then it came back after some time.

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so any suggestions?