Default [Q] Problem with USB connectivity

Having a Problem connecting to pc
i had updated my n7000 to kitkat omni rom. the internal memory gets crashed so frequently so i need help to go back for the offical jelly bean.
so plz provide me some links to go back for stock firmware.
i tried to connect my phone but it does'nt get detected.
so is there an other way to flash stock firmware without using ODIN.