Ensure your SD card is formatted as FAT32 . While exFAT can handle single files over 4GB, FAT32 is much more stable for CFW and prevents data corruption. Use an NSP splitter if your file is larger than 4GB.
If you prefer to play directly on your Switch, here's a general overview of the process using a custom firmware like Atmosphere. hyrule warriors age of calamity switch nsp u portable
Modding your Nintendo Switch console and installing backup NSP files carries inherent risks, including the potential for bricking your device or receiving a permanent online ban from Nintendo. Always backup your NAND before making alterations, and never connect to official Nintendo servers while running custom firmware. If you want to fine-tune your configuration, tell me: Ensure your SD card is formatted as FAT32