Karbonn a21 dead Solution Here Tested By Me

press vol down + power
if mobile same as pic
insert usb
install driver
see in device manager
qualcom 9006 port
use emmc write tool with bp firmware
after write imei your mobile on
if not on press volup power,this time your mobile enter in fast boot mode( green )
then mobile flash with ap firmware


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if mobile totally dead & device manager qualcomm 9008 com appear
then use qpst tool
and rename this two filename in qpst tool according to your phone bp firmware
bp firmware folder inside .hex and .mbn file name
open bp firmware folder
select .hex file rename option and copy name and paste in qpst phone program flasher name same as pic
mbn file name copy and past in qpst tool
boot image mbn file




load xml & patch file in a21 bp firmware same as pic



select bp firmware in path 2



press download

after this prosess
your mobile not on
your mobile enter in qpst download mode or fast boot mode and see in device manager
qualcom 9006 port appear(auto convert 9008 to 9006)

if enter qpst download mode
agan flash bp firmware with emmc download tool
then write ap in fast boot mode


Tools Needed:

1. Dead Phone (When u connect to PC it should install Qualcomm HS-USB QD Loader 9008 Driver) Download Link
2. QPST.2.7.399 Download link
3. Flare Revival kit Download Link
4. PC with 32 bit Windows (XP/Vista/7/8) (64bit casus problem in QPST
5. installation)

Here is full tutorial Download link