Games start and quit faster, and resuming goes straight from the menu to your game without a black screen. RetroAchievements can download achievement data one console at a time, and about a thousand more cheats work, including MSX. Home, the Grid and Settings get a round of layout fixes, and Save & Quit from the in-game menu no longer crashes.
More details available in https://nxredux.com/reference/release-notes/
Select zip files that is relevant to your platform and extract it to your exFAT formatted SDCARD. Alternatively, you can update directly using the OTA update feature in the device.
Coming from v1.x? Back up your SD card before updating. A clean install is recommended: delete the hidden .system and .tmp_update folders from the card (keep Roms, Saves, Bios and .userdata, so your games, saves and settings stay), then extract this release as usual.
If you have any questions, please open an issue in the repository.
Full Changelog: nx-redux/nx-handheld@v2.3.0...v2.4.0