codes to launch various factory tests:
*#*#0283#*#* packet loopback
*#*#0*#*#* lcd test
*#*#0673#*#* melody test
*#*#0842#*#* device test (vibration test and backlight test)
*#*#2663#*#* touch screen version
*#*#2664#*#* touch screen test
*#*#0588#*#* proximity sensor test
*#*#3264#*#* ram version
note:
Hard reset deletes all files and settings in internal memory, or equal to reformat the firmware warning! If it's direct push hardreset, guns cancel option.
Factory reset just delete the account, system and application settings
But if I was in the Custom ROM, such as using CyanogenMod is not possible to use the above
Disclaimer: We are not Responsible for any Damages that may be happened to your Device in the process that we mentioned in the following guide. If any issues happens, we will help you to resolve the problem. Also Keep in mind rooting will void your device’s warranty.