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this solution is to fix the proximity sensor which goes bad sometimes and even after the call the screen stays black until the person on line cuts the phone or if you press the power button this happens due to dirt and dust accumulating over sensor. so to check if your sensor is working properly do the below test to check sensor dial *#0*# and select sensors(tested on note 2,s4,note 3) when u put your hand on proximity sensor screen turns green with vibration and when u lift your hand it turns back to white but if it doesnt turn white after removing hand that means the sensor has a problem so we lower the value at which the sensor responds note :-you need to be rooted to follow this procedure open cmd and change to your adb folder and type the following command adb shell (you will get a notification on your phone screen accept it) su (give root privilege in phone) echo 0 > /sys/devices/virtual/sensors/proximity_sensor/prox_cal echo 1 > /sys/devices/virtual/sensors/proximity_sensor/prox_cal NOW cat state # put your finger on the sensor and check the value (my came 255) now remove your finger from sensor (it came 51) cat state # This returned 255 #finger on the sensor and 51 #blank value and then do cat /sys/devices/virtual/sensors/proximity_sensor/prox_cal this returned 0,60 45.....so my offset was 0. Ths sum of offset and #blank value was 0 + 51 = 51 that is equal to 33 in HEX. so i increased to 55 and hex value 37 then echo -en $'\x37' > /efs/prox_cal the value 37 will change according to your phone do the above math chown system:system /efs/prox_cal chmod 644 /efs/prox_cal sync reboot now the sensor is working you can check again by dialing *#0*# and do the test again

Hi, My Samsung Note - 2, Official Indian Phone got upgraded to Jelly Bean 4.3 Build : JSS15J.N7100XXUEMK4 from its software upgrade option. But i am facing lot of issues with the newer version like, performance has become very poor, lot of Lagging, slowness, TouchWIZ error etc. so getting bugged to use the version. Only + point is battery works better and looks are little crispy... I need help to downgrade it back to the older version of Jellybean 4.1 which used to come with new phone. Also i need official OS and not edited or custom ROMs. Please help me how to do this..... Thanks in Advance.