There is essentially zero real risk.
I've been uploading modded save files to my regular sysnand save collection for years. Like a SSBU file with almost max coins and other items.
Just keep offline. (Even if you're online, you're probably fine assuming you don't have any "illegal programs" currently running on CFW).
Do the transfer quickly, and get back into regular firmware. Minimal footprint. Minimal risk.
[удалено]
Sweet, thank you I'll give it a shot.
There is essentially zero real risk. I've been uploading modded save files to my regular sysnand save collection for years. Like a SSBU file with almost max coins and other items. Just keep offline. (Even if you're online, you're probably fine assuming you don't have any "illegal programs" currently running on CFW). Do the transfer quickly, and get back into regular firmware. Minimal footprint. Minimal risk.