(Guide) How to backup your NVRAM partition (IMEI, Mac address etc. )
Credits~ MD Rajaul ~ Anythingultimate.in
Note~You can get the scatter file from stock ROM zip or Marshmallow build zip.
After backup of NVRAM partition you will have to no longer worry about losing Coolpad Note 3 or any other MT6595/6752/6732/6753/6735/8173/2601/6795/8163/8590/6580/6570 based device’s IMEI, MAC address, Bluetooth address etc. So, lets see How we may do that so if accidentally we lose IMEI, MAC etc. then we will be able to restore that back.
We will need following tools/files to this whole process:
2. Sp flash tool
3. Scatter file
Now first you have to install your MTK drivers. If you have already installed drivers to your PC then leave this step.
After driver installation download your scatter file, open that and Search for the word “Note down the values of “physical_start_addr:” and “partition_size:” (different devices have different values. For coolpad note 3; values are 0x380000 and 0x500000 respectively.
Now download Sp flash tool and open that. Select the scatter file and then click on Readback.
After that click on Add and then double click on created file.
Chose a folder to save this and name the file as nvram.img and click save.
Then Fill the values noted previously to “Start Address” and the “Length”.
Click OK, then click the “Read Back”, turn off your phone, connect your mobile phone to the computer using USB cable. Wait for the completion of readback process, you will get a NVRAM. img file inside the folder selected above.
How to restore back:
Open the your scatter file and search the NVRAM.rename file name from “None” to “nvram.img” and is_download:as “false” to “true” .
Now open flashtool and select the modified scatter file and select only nvram.img.Click on Download.
Turn off your phone; connect your mobile phone to the computer using USB cable. wait for the completion of download process, Disconnect your phone after process completion and restart your phone, you will find the lost MAC address, IMEI, Bluetooth, etc. have already come back.
Congratulations, you have successfully restored you lost MAC address, IMEI, Bluetooth, etc.