Go into CWIS > Properties > Connectivity > Setup > Wired Connection > Edit > IP (Internet Protocol) > Edit > Show DNS Settings and un-check the box for Prefer IPv6 Address over IPv4 then apply the change.
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Then you will need to get someone else to try, the settings I listed are exactly what is needed, the firmware I linked is the latest one available and it can't be corruption because you have completely wiped the device and rebuilt it from scratch (altboot).
