IMEI Restore for Xiaomi Mi Max

STEP 1:

Mi Max must be rooted, download a Mi Max Global/China custom/stock rom.

https://drive.google.com/file/d/0B3bizPCWTBjcaHZfYWJ4MVBXWk0/view?usp=sharing

Download the above rar file which contains Qualcomm QPST Tool, the IMEI Converter, and adb files. Then installed Qualcomm QPST Tool.

STEP 2:

Once installed, connect your phone to the computer and open the adb folder.
Make sure your phone has "USB Debugging" enabled.

Hold "Shift" and right click on the blank area of the folder and select "Open command window here"

@ command prompt , type "adb shell" and press enter. Type "su" and your phone should have root privelages. Finally, type "setprop sys.usb.config diag,adb"

Your phone should now be in diagnostic mode.

Open QPST Configuration located at "C:\Program Files (x86)\Qualcomm\QPST\bin" or wherever you installed it. Your phone should show up under "Active phones"

Click the "Start Clients" tab, then "Software Download"

Go to the “backup” tab and create a backup of your QCN file, save it somewhere safe.
It’s extremely important that you create this backup in case you mess up something later on.
You will be able to restore the QCN file as easily as you backed it up.

If you need to restore the QCN file, go to the “restore” tab and select the QCN file you backed up.

After you have backed up the QCN file, navigate to where you installed QPST and find the program “RF_NV_Manager” for me, it is located in “C:\Program Files (64)\Qualcomm\QPST\bin”

Open RF_MV_Manager and connect the phone.

In RF_MV_Manager, click "File" then click "Read supported RF NV items"

Look for number 550. It should say "NV_UE_IMEI_I"

There will be 9 black fields, this is where you enter your IMEI number.
Click the "hex" button.

Open the IMEI converter program located in the folder you downlaoded

Use the IMEI convertor to convert your IMEI number to HEX. Make sure you enter your IMEI number correctly.

Once the IMEI number is converted, start filling in the blank fields on number 550 in the RV NV Manager.

There should be two characters per field.

For example, field 1 will be something like 08, field 2 will be something like 9A.
ONLY PUT TWO CHARACTERS PER FIELD.

After all the boxes are filled in correctly, click the "Write NV" button.

The changes should then be written to the phone. Reboot the phone and then dial *#06# to check the changes. your IMEI number should be back and you should then be able to log into your MI Account and use other features that require your IMEI number.