The main menu gets a new look: the tabs move to the bottom bar, unselected art turns grey so the selection stands out in your Main color, and lists fade at their edges instead of showing scroll arrows. PICO-8 can run on your own official PICO-8, with Splore to browse and download carts. Game Boy Advance music plays at the right speed, and a Pokémon game's clock keeps real time across resumes.
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: v2.4.2...v2.5.0