Press "*#06#" on dial and IMEI numbers will be shown. Or you can look for IMEI number on product box. Also can query on the settings interface.
Generally a hard reset can be done in “Setting-Backup & reset;-Factory data reset” when your phone can be turned on.If it is dead,please do this in recovery mode.Press Vol+ and Power buttons for more than three seconds,find “wipe data/factory reset”,click “Yes-delete all user data”.After this step,select “reboot system now”.
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.
You can install MTP USB driver in Windows.Please connect your phone to PC,open “Device Manager” and find the location of your phone and right click it,choose “update driver software”-”Browse my computer for driver software”-”Let me pick from a list of devices on my computer”-choose “MTP USB Device” in the list and click “Next”.
Find “Setting-About phone-Wireless update-Check update”.It will show that your system is up-to-date after update package installed.
It means you have installed apps in internal storage instead of SD card.Please check carefully and charge the preferred install location in “Setting-Storage”.