Latest Samsung GALAXY On5 (SM-G550T1) - TMK firmware
Samsung GALAXY On5 (SM-G550T1) firmware for USA (MetroPCS) (TMK): 1 build in the SamMobile archive, newest first. The latest is G550T1UVU2AQC4 (Android 6.0.1, built 23 March 2017). Open a build to download it, or switch region with the country selector.