Can I disable IPV6 in 21.02?

I need to disable IPV6 because software I use stops working correctly when it's enabled. My ISP doesn't support IPV6 either so it's completely unnecessary. How can I disable it entirely on the WAN and LAN interface?

You should clarify what exactly is not working.
So, we can try to find the most suitable solution.

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(post deleted by author)

It's an ancient video game that hasn't been updated to support ipv6. There is a bug where it crashes if ipv6 is enabled on your router. The only solution is to turn it off entirely or else I am unable to play it. My old router used openwrt as a base but was modified and there was a simple toggle to turn off ipv6.

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uci -q delete dhcp.lan.dhcpv6
uci -q delete dhcp.lan.ra
uci commit dhcp
/etc/init.d/odhcpd restart
uci -q delete network.lan.ip6assign
uci commit network
/etc/init.d/network restart

thank you, going to try this now.

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