NVRAM is a crucial partition of our device. Without this partition, the device can’t detect network signals. So, having a backup NVRAM is a must before making any modifications to the device. The process works on MT65XX Devices/ 6752/ 6732/ 6753/ 6735/ 8173/ 2601/ 6795 8163/8590/6580/6570/6752/ 6767/ 6765/ Helio P10 /Helio P20 /Helio X10 /Helio X20 /MT6737T/MT6735M and all other latest Mediatek MT67XX devices. This method allows you to backup NVRAM, including IMEI, MAC address, Bluetooth address, etc. Let’s see how we can do this so that if we accidentally lose IMEI, MAC, etc., we can restore them.
Why You Should Backup NVRAM on Mediatek Devices
Creating a backup NVRAM ensures that you can recover essential network-related information in case of data corruption or device modification errors. By securing this partition, you prevent connectivity issues related to IMEI loss, MAC address failures, and Bluetooth malfunctions.
What We Need
- V-Com Driver
- SP Flash Tools
- PC and USB Cable
- Scatter File (Take from ROM or create using MTK tools)
- Patience
Note: QCOM users should use QPST, enable the Diag Port, and select the NVRAM section from QPST.
How to Backup NVRAM on Mediatek MT67XX Devices
Step 1: Install MTK Drivers
If you have already installed the drivers on your PC, skip this step. Otherwise, install the necessary MTK drivers to ensure proper communication between your device and the computer.
Step 2: Download the Scatter File
Open the scatter file and search for the word “NVRAM” within the file.
Step 3: Note Down Key Values
Identify and note the values of “physical_start_addr:” and “partition_size:”. These values vary between devices. For example, for Coolpad Note 3, the values are 0x380000 and 0x500000 respectively.
Step 4: Open SP Flash Tool
Download and open SP Flash Tool. Select the scatter file and navigate to the Readback option.
Step 5: Create a Readback File
Click Add, then double-click on the created file.
Step 6: Save the Backup File
Choose a folder to save the backup and name the file as nvram.img. Click Save.
Step 7: Input Values and Start Backup
Enter the previously noted values in “Start Address” and “Length”.
Step 8: Complete the Readback Process
Click OK, then click Read Back. Turn off your phone and connect it to the computer via a USB cable. Wait for the process to complete. After completion, you will find the NVRAM.img file inside the selected folder.
How to Restore NVRAM on Mediatek Devices
Step 1: Modify the Scatter File
Open your scatter file using Notepad and search for NVRAM. Rename the file from “None” to “nvram.img” and change is_download: from “false” to “true”.
Step 2: Load the Modified Scatter File
Open SP Flash Tool, select the modified scatter file, and choose only nvram.img. Click Download.
Step 3: Restore NVRAM
Turn off your phone and connect it to the computer via a USB cable. Wait for the download process to complete. Once finished, disconnect your phone and restart it. Your lost MAC address, IMEI, Bluetooth, etc. should now be restored successfully.
Finally
This is a complete guide on how to backup NVRAM partitions on Mediatek MT65XX and MT67XX devices. Ensuring a backup NVRAM will safeguard your device’s network connectivity in case of accidental data loss. Always create a backup before modifying your device to avoid any potential issues.
