I finally managed to transfer my BotW save files between systems : r/wiiu
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Guide: How to Transfer Miis to Your Nintendo Switch | Nintendo Wire
How To Prepare Your 3DS And Wii U For Retirement - Hard Drive, Battery, Backup Tips | Nintendo Life
Transfer Minecraft Worlds from Wii U to Switch | Xbox Support
Play Wii U Games on Nintendo Switch with USB add-on! - SM128C.com
Nintendo Support: How to Transfer Content Between Two Wii U Consoles
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Simple Ways to Transfer Games from Switch to Switch: 14 Steps
How to Play Wii Games On Your Wii U Gamepad - YouTube
Simple Ways to Transfer Games from Switch to Switch: 14 Steps
Wii U Game icons won't stay in folders (powered USB hub) | GBAtemp.net - The Independent Video Game Community
Can You Play Nintendo Wii Games on the Nintendo Switch?
How to Transfer Minecraft Wii U Game Save Files to Nintendo Switch - YouTube
How To Prepare Your 3DS And Wii U For Retirement - Hard Drive, Battery, Backup Tips | Nintendo Life
Nintendo Support: How to Transfer Content Between Two Wii U Consoles
Wii U backwards compatibility explained: How to play Wii or older games on the current-gen console
What Happens When you put a Wii U Game in a Nintendo Switch - YouTube
