My phone was infected with viruses and it was successfully rooted with KingRoot. But somehow after that I can't regain root access after factory reset, virus still there, I think KingRoot automatically installed some viruses after displayed many ads. I was searched for many root methods on internet, but none of them worked, until I see this topic forum 4pda.ru (russian mobile phones forum) - credit also goes to them, thanks.
So what you need is download the system.img archive folder (contain stock rom and rooted, plus adb/fastboot utilities) from here or here.
1. Extract archive.
2. Plug your phone into PC. Run Bootstrap to install mobile phone driver if you haven't do. Make sure its appear internal storage on PC by selecting "Mass Storage mounting" and not CD disk.
3. Go to Developer Options -> activate "USB Debugging".
4. Open command prompt console in the extracted folder and ready to enter some commands.
5. adb devices -> to make sure PC recognized your phone.
6. adb reboot bootloader -> enter fastboot.
7. fastboot flash system system.img -> wait a couple of minutes. You must remain the USB connection or its will bricked or you'll be facing another consequences.
8. fastboot reboot when its done.
4pda.ru member also mentioned how to flash firmware v2.006. All things pretty simple, you can use Google Translate to see what they said.
Strangely, you can flash a system.img with an locked bootloader and you can even use CWM Recovery without flashing and restoring v.2006 & even flash the modem image.
So what you need is download the system.img archive folder (contain stock rom and rooted, plus adb/fastboot utilities) from here or here.
1. Extract archive.
2. Plug your phone into PC. Run Bootstrap to install mobile phone driver if you haven't do. Make sure its appear internal storage on PC by selecting "Mass Storage mounting" and not CD disk.
3. Go to Developer Options -> activate "USB Debugging".
4. Open command prompt console in the extracted folder and ready to enter some commands.
5. adb devices -> to make sure PC recognized your phone.
6. adb reboot bootloader -> enter fastboot.
7. fastboot flash system system.img -> wait a couple of minutes. You must remain the USB connection or its will bricked or you'll be facing another consequences.
8. fastboot reboot when its done.
4pda.ru member also mentioned how to flash firmware v2.006. All things pretty simple, you can use Google Translate to see what they said.
Strangely, you can flash a system.img with an locked bootloader and you can even use CWM Recovery without flashing and restoring v.2006 & even flash the modem image.
