Samsung is now rolling out a new software update T810XXU2DQCL for Galaxy Tab S2 9.7. The new update comes with Android March security patch which includes fixes for vulnerabilities and exposures in the Android OS.
Also, the firmware update includes device stability improvements, bug fixes and further improvements for performance. Nougat update for the device is also expected this month.
Software Update T810XXU2DQCL for Galaxy Tab S2 9.7 is now available as OTA update. You can also check manually for updates, Go to Settings > About device > System update.