: Reputable databases like SamMobile and SamFrew host searchable libraries of historical and current firmware versions for various regions. Firmware Version History has received several significant updates to its Tizen OS: Gear S2 (SM-R720) - Notify Update - Samsung
Not necessarily. It will fix software corruption, but the hardware (Exynos 3250 dual-core, 512MB RAM) is the bottleneck. A factory reset (without flashing) often yields the same speed improvement.