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To convert your ERC721 tokens into X404, simply connect your EOA wallet, such as MetaMask, to the X404 NFT hub. Visit the X404 NFT hub page at https://x404.xrgb.xyz, select the NFT pool you own, and then click to connect your wallet. Initially, X404 will primarily support centralized NFTs on the Ethereum network and gradually expand its support for various types of NFTs in the future, eventually extending to multiple chains such as the Bitcoin network.