Hi, I have an old pixel 3 xl not supported. Is it too old to use graphene os on since it's not supported? I've read it's too insecure. So if so should I just sell it?

    graphy22 It's too old. 4th and 5th generation Pixels are also too old for current GrapheneOS and aren't secure devices but we still partially support them with legacy branches of GrapheneOS for harm reduction.

    Sell it or trade it in when buying a new device. It's insecure and lacks support. There's no OS you can put on it to make it reasonably secure. Buy one of the recommended devices, ideally an 8th/9th generation Pixel.