BEWAR OF SAMSUNG , THERE IS AN APPLICATION SAMSUNG KNOX WHICH CHECKS FOR IF USER INSTALLS ANY CUSTOM ROM ON THE DEVICE AND ONCE IT GETS TRIGGERED THEN AS ON BOARD ECOUTER STARTED SHIWING TAMPERED SING AND YOUR DEVICE IS CONSIDERED SINGN AND YOUR DEVICE IS CONSIDERED OUT OF WARRENTY , AND ALSO PROPRIETARY SAMSUNG APPLIXATION ALSO STOP WIRKING LIKES S HEALTH , KNOW, SAMSUNG OAY ETC, IN MY CASE , MY DEVICE WAS WORKING perfectly fine ON MARSHMALLOW ANDROID OS 6, ABD THEN I RECEIVED AN OTA UODATE FRIM SAMSUNG AFTER ALSO THE KNOX ECOUTER STARTED SHIWING TAMPERED SING , I WENT TO SERVICE CENTER ALSO CALLED SAMSUNG CUTOMER SUPPOERT BUT THEY SIMPLY IGNORED AND REPLIED TO ME THAT ITS YOUR MUSTALKE THAT I DID THE OTA UPDATE which CAUSE THIS PROBLEM