Now, enter the first 14 digits of the IMEI you wish to write. Click SIM_1 or SIM_2 depending on which you wish to write IMEI to. You should see the path to the DB file under NVRAM Database File.In the window that pops up, navigate to the location of the BPLGUInfo file (often named like BPLGUInfoCustomAppSrcP_MT65**.), select it then click Open.Click on the dropdown at the top left corner and select IMEI download.You can now minimize the Get version box.In the Get version box, click Get target version to confirm that the phone has been detected.The circle should now be yellow in color, indicating that the phone has been successfully detected The phone should boot up then get stuck at boot animation.Switch off the phone (still with battery inside) and connect it to the PC without holding any button on the phone. The color of the circle should start changing between red and green. Click Reconnect at the top-right corner.Under Connection Type, select the option which best describes your device Wait till the Maui META dashboard appears with a red circle.It should be installed to Program files or Program files (x86) folder depending on your PC's architecture. Anyways what I remember is that you need correct modem database file to fix IMEI for K4 Note (MT6753 chipset). Deselect all files and select only nvram. If you don't have nvram.bin backup then download this. Nvram database file mt6735 download If yours is a Mediatek chipset based smartphone, such as One and while experimenting with custom ROMs or making any modification in the system, you may accidentally lose NVRAM data. Unzip Maui META, install it on the PC then run as Administrator.Get the BPLGUInfo file (its named MDDB on some phones) for the phone model from the or by How to use Maui Meta 3G Follow the steps below to successfully write IMEI, Barcode, Serial Number etc using Maui Meta See the video tutorial below or.It could range from an overlap error (flashing an image that's too large to a neighboring partition) to formatting. What causes Null IMEI or invalid Serial Number? This often happens when the Secro & NVRAM partition gets wiped or corrupted. Its important you fix unknown Baseband first (by re-flashing the firmware or at least secro) before going ahead to write IMEI. When you have null IMEI, your device might not detect SIM cards or network signal. Maui META enables you write IMEI, Serial Number etc to a Mediatek (MTK) Android device.