Tagged: A210, AOSP ROM, Canvas 4, Micromax
You need to find out the radio.img file for your phone and flash that using fastboot. I will look around and post the radio.img file here if I find something! Good Luck!
after following your instruction i upgraded MIcromax canvas 4 a210 from jelly bean to kitkat
but after upgrading to kitkat my internal sd card is not detected by android os.
kindly provide solution