[How-To] Restore Lost Imei [Qualcoom Chipset]
Tools Needed: 
- Phone;
- USB Cable;
- QPST Application v2.7.323 (must be this version);
- Patience;
- Caution!!!
- Install QPST application from above link;
- Reboot your PC
- Find your phone IMEI number on your phone box, battery, under battery, whatever;
- Turn off your phone;
- Open "Device Manager" on your PC;
- Hold "Volume -" button and connect your phone to your PC through USB cable (this button sequence is for Lenovo K910 only);
- Release "Volume -" button when Lenovo logo appears;
- By this time your phone should enter on "Factory Mode" and your "Device Manager" should be able to see the following COM port (port number may differ);
- Remember "HS-USB Diagnostic" COM number;
- Open QPSTConfig as administrator(this should be on your installation path i.e C:\Program Files (x86)\QPST\bin);
- Go to "Ports" tab and click "Add New Port";
- On the new window uncheck "Show Serial and USB/QC Diagnostic port only"
- On "Port:" put COM number seen on "Device Manager" earlier;
- On "Port Label:" you can put anything;
- Click "OK"
- By this time you should get something like: (don't bother with Phone code numbers. this should be different);
- Now go to "Active Phones" tab;
- Click on your phone from the list and go to "Start Clients";
- On RF NV Item manager, go to "Settings > Comport";
- Select your COM port and click "OK";
- Click "File" > "Read Supported NV RF";
- From the list, go to 550 number and you will get 9 blank lines;
- Check "Hex" box;
- BE CAREFUL NOW THIS IS THE MOST IMPORTANT THING!!!
- You will see 9 text boxes and where you should put your IMEI number. You should do this EXACTLY as described or else...
- You should put your IMEI backward.
- Let's take this number as an example: 112233445566778. The boxes should be filled with: or
- Once you enter the data, press Write Changed NV on "File"
- Reboot your phone
- Confirm your IMEI number by typing *#*#06# Hope this will help you to recover your lost IMEI number
