: Potential bugs with the camera or FM radio, slightly higher battery drain, requires a custom recovery like TWRP to install.

: It is the most stable option but extremely outdated. Most modern apps (YouTube, WhatsApp, Banking) will no longer work on this version.

: Full hardware compatibility, stable camera, original features (S Voice, Smart Stay).

: Versions like CyanogenMod 13 (Android 6.0) or unofficial LineageOS (up to Android 7.1) give the phone a much-needed speed boost.