I'm assuming you mean that you have a lan connection but no wifi?
I guess you could try to set your PC as a virtual router (requires specific hardware) and connect the phone to that..
In theory that would allow you to update? haven't tried it
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if your PC is wifi capable you can turn it into a hotspot using Mhotspot,i have personally used it for many years and is the best freeware to do the job. you can download it here :> mHotspot ? Turn your Laptop into WiFi Hotspot