Installing OpenWrt on Netgear AC720 R6020

Wikidevi says this is the same hardware as the R6120

I'm trying to follow the install instructions for the R6120, but I can't get it going.
nmrpflash -L outputs:
"net0 Macaddress (Ethernet)
net3 Macaddress (Bluetooth Network Connection)"

Then I power off the router like it says and run nmrpflash -i net0 -f openwrt-ramips-mt76x8-netgear_r6120-squashfs-factory.img -a
But it just says "Address cannot be used on interface net0."
I've tried using eth0 instead like in the guide but that gives me "Invalid interface alias"
And using the example IP obviously doesn't work.

So I don't know what to do now. There's no results for these errors on google.

Are you running it as root? Regular users cannot take direct control of an Ethernet port.

Well I'm on Windows but I'm running it as an administrator.

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