Download(flash it) last software version (recomended ver of U600**GD4~)
Then input keystring(enter) *#9998*86824# to download firmware of touch
key from main binary newly downloaded to IC ROM of touch key.(The time
required will take nearly 20 seconds) if succesfull,you can see message "TOUCHKEY DOWNLOAD COMPLETE"
Then Power ON/OFF(Reboot)When upgrade completed.
Then check download success, enter *#0206*8376263# and confirm touch ver:1.3

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