Reasons for why I am returning WN3000RPv3

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David415 wrote:

1. Unable to register it (and receive technical support) because Netgear's website won't accept the serial number on the back of the device.

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Preowned device, or somebody might have abused or mistyped your device serial number - only a Netgear moderator can help with this.

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David415 wrote:

2. Unable to connect the device via the Web Brower setup because NETGEAR_EXT won't accept username and password previously entered into its website.

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The network security key is a dedicated control, and not related to the username and password configued for your WN3000RPv3 management access.

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David415 wrote:

3. Unable to log in to extender via web browser because the URL provided by Netgear doesn't work (i.e. http://mywifiext.local).

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These simple URLs can only be used of connected direct through the device, either to the wireless by a computer Ethernet port with a network cable ot the device LAN port. Once the device is connected to your router wireless, you can locate it's IP address from your router DHCP table or attached devices and call it from your brwoser using http://[WN3000RPv3-IPaddress]/

As suggested by plemans before, start with a factory reset again. Depending on the curent status, update the WN3000RPv3 firmware. Then follow the installation guide.