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I installed Ignited via SideStore. No Jailbreaking necessary. Not computer tether. SideStore can renew the side loaded emulator every 7 days when on WiFi. The iPhone is perfect for DS emulation with a stylus.
(Ignited is a fork of Delta with more options, and SideStore is a fork of AltStore, with no computer tether needed)
The native file manager kinda sucks. It's clunky and doesn't have many features. On the other hand, FX on Android is super fast and feature rich. So much better than the stock Android file manager.