: The last major official update for the Sprint Galaxy S3 was Android 4.3 Jelly Bean (specifically builds like MK3).
While physical manuals are rare now, the following community resources act as the definitive "papers" for this device: Sprint Firmware Galaxy S3
Are you looking to settings, or are you trying to upgrade it to a newer version of Android via custom software? : The last major official update for the
: For users on the final 4.3 firmware, the Saferoot method on XDA is often cited as the best way to gain control without tripping security flags like Knox. : Be aware that early OTA (over-the-air) updates
: Be aware that early OTA (over-the-air) updates specifically removed the "Universal Search" feature from the Google search bar due to legal disputes, restricting it to web-only results. Helpful "Paper" & Guides
If you're looking for help with the firmware, you’ve likely found that this legacy device has a unique history regarding updates, rooting, and recovery. Core Firmware Knowledge
: Crucial: Never flash firmware designed for the international version (i9300) on a Sprint S3. This is a common cause for "hard-bricking" the device because the processors (Exynos vs. Snapdragon) and radios are entirely different.