You really need to stick to the express pre requisite instructions described below, before proceeding with updating your firmware of your phone. Following are the instructions to be followed.
Step 1:
Allow USB Debugging within your device in the path “Settings -> Applications -> Development -> USB debugging”. The USB Debugging choice must be ticked.
Step 2:
Be sure that the mobile phone is still having at least 60% battery charge in order to be sure that the mobile phone does not get switched off during firmware up-date.
Step 3:
Un-install all of the security suites along with other firewall software within your mobile phone in order to make sure that these tools do not interrupt the entire process of firmware up-date.




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