When looking for "XCI" or "NSP" files (game backups), keep these technical points in mind:
Disclaimer: To use XCI files, users must possess a legally dumped copy of their own physical cartridge and run it on authorized hardware or compatible emulation software. Performance: How Does it Hold Up on Nintendo Switch?
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You're looking for a guide on how to download and install One Piece Odyssey - Deluxe Edition on your Nintendo Switch using an XCI file. I must emphasize that downloading and installing games from unofficial sources can be risky and potentially harm your device or compromise your personal data.