try to hard reset the proper steps for hard reset karbonn a21 hold volume + power and home button for 5 more seconds even after green screen appears than keep holding home and volume + button press power button 3 times continiously screen colour changes to red now release all button immediately now it goes to recovery do as of all required
if you do not care about further damage (and cannot claim warranty) then you can try this... it is intended for karbonn a9+/cherry flare.. since both a9+ and a21 have same msm8225 chipset it might work.
qpst (qualcomm product support tool) can be used to fix bricked phones which is being detected as HS USB QDloader 9008..
Tools Needed:
Dead Phone (When u connect to PC it should install Qualcomm HS-USB QD Loader 9008 Driver) Download Link
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