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How to use OTA to update Android system?

Find “Setting-About phone-Wireless update-Check update”.It will show that your system is up-to-date after update package installed.

Why the sound(loudspeaker/microphone/receiver) is so weak in my phone?

Please enter engineering mode(press *#*#3646633#*#* on dial) to modify some settings.Find the option “Audio”,you can see many sound option,such as “Headset mode” “Loudspeaker mode” “Speech enhancement”.Choose one of them according to your need and modify the value to a higher one.Note:Please do this carefully and do not change other setting,we are not responsible for damage caused by change setting arbitrarily.