How To Fix IMEI Permanently

You flashed a ROM to your android phone & got invalid IMEI. It usually happens when you use "Format All + Download" in SP Flash Tool.
You can fix IMEI permanently. All you have to do is to follow the instructions below.

You are required to download the following files.
 * Maui Meta 3G
https://mega.nz/#!Tso0BRKD!KfGPchzkFPO8pO82Oy35YALYChJiRWzBz8474BIM3T8

* Android Gadget Drivers

https://mega.nz/#!ns4lABaI!JI5Stw3Dqi0yR7xZ-LkUSGDf87BnIL9Wxnq39XKCluc

* Database File 

https://mega.nz/#!yxpC0LwA!8FwWj5txwARiDTKXWGUdObM2Mw4Ha179K7lvDx0R0Qs

(I have MTK6582 phone so the above link is for MTK6582 Database file. You have to use the database file of your phone)

Now install the Android gadget driver if is not already installed. 

- Switch off your phone.

- Open Maui Meta 3G.

- Click on "Options" tab & then put a check on "Connect Smart phone into META mode".

- Click on "Reconnect".

- Now connect your phone to your PC (make sure your phone is still powered off). It will boot up & stuck at boot logo.

- A popup will appear. Close it.

- Click drop down menu & select IMEI download.

- Click "Change NVRAM Database File" & select the database file your phone.

- Now click on Sim_1 or Sim_2 whichever you wish to change (you can change both).

- Enter your IMEI number. Just enter 13 digits of your IMEI number. The last digit will automatically appear in the CheckSum box.

- Now Click on "Download To Flash".

Its Done! You just fixed your IMEI permanently.

Disconnect your phone from PC. Remove battery. Reinsert battery. Turn on your phone & enjoy.