Latest Samsung Galaxy Tab S 8.4 (SC-03G) - DCM firmware
Samsung Galaxy Tab S 8.4 (SC-03G) firmware for Japan (DCM): 1 build in the SamMobile archive, newest first. The latest is SC03GOMU1BOH7 (Android 5.0.2, built 20 August 2015). Open a build to download it, or switch region with the country selector.