How to restore Samsung Galaxy S4 to offical
I have an original Samsung Galaxy S4. It has been updated to original 4.4.2 KitKat. This firmware is very wrong (slow, and battery runs out very soon).
I want to downgrade it to previous 4.3 firmware.
My problem is that Write protection is enabled on the device.
Could you help me how I can disable write protection, flash the 4.3 firmware and restore it to official?
I already downloaded the original 4.3 firmware which is appropriate for my device.
Thanks a lot!
Samsung Galaxy S4