yone ... i m new here . i have a grand 2 dead while downgrading from 4.4.2 .. i dont have adf tools(i found a method using this device (atf box) but i havent it ) but i heared that the Sd card method can repair it.. i found a method for samsung S3 in youtube that using .bin file and put it in sd card using win32diskimager .. i searched for that file for my phone but i didnt find it ..
no method would work i have personally gone through this and finally you will have to take it to the service center
the service centre representative asked me whether its rooted or not
never say yes tell them that your were upgrading through kies and the pc rebooted and then phone is not booting then they will not ask you anything simply they will change the motherboard and upload the IEMI and other software and give it to you(estimated time of repair depends on the availability of the hardware)
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