[Q] Reflashing Kitkat 4.4.2 on Tab 3 7 T210 topic

Hi guys. Well sorry for being so formal but tell me something. After updating my Samsung Galaxy Tab 3 T210 to KK my accelorometer has stopped working. It works 1 in a 100 times and most of the time cpu z doesn't recognize it. What i'm thinking is that can i reflash offical stock KK firmware through odin without any problem? Surely I won't have to unlock bootloader if it is present. I don't know if there is a bootloader or not..... Steps and answers would be appreciated. Thanks. :D