It is big problem if you select USA band the signal of one or both SIM cards will be lost; factory reset will also not help however by following these steps you can save all your data and the headache in reloading all the software.
1. Open settings in your phone tap on About phone. Tap 5 times on build number.
2. Come back to the settings and you can find Developer options. Tap on it.
3. Tap "ON" and enable "USB debugging"
4. Download in your PC/Laptop minimal_adb_fastboot_v1.4.1_setup from https://www.androidfilehost.com/?fid=385035244224386526
2. Come back to the settings and you can find Developer options. Tap on it.
3. Tap "ON" and enable "USB debugging"
4. Download in your PC/Laptop minimal_adb_fastboot_v1.4.1_setup from https://www.androidfilehost.com/?fid=385035244224386526
5. the download will be from a mirror site. Install the same in your PC/ laptop.
6. Run the software a command prompt will open.
7. get the Android phone in fast boot mode by following steps
a Turn off your phone.
b Hold down Volume Down + Power button.
c Release the Power button and continue to hold the Volume Down key until you enter into the bootloader. ...
d Scroll up or down with Volume keys and select Fastboot with the power key.
9. Connect your laptop to phone by USB cable, select USB to file transfer mode and also keep debugging mode on.
10. enter the following command in command prompt and press enter after each line
adb reboot bootloader
fastboot erase modemst1
fastboot erase modemst2
fastboot reboot
11. If phone the command does not detect phone .. pl download the drivers for your mobile or download the PC Suite by your phone manufacturer.
12. switch off the phone by selecting off menu by using volume key and press power key once to select.
13. Disconnect USB, power on AND volla the signal will be detected in sim 1
14. Don't forget to like and leave your comments
