Fix: Poco M4 Pro IMEI, Baseband, NVRAM WARNING, or NVDATA CORRUPTED

Fix: Poco M4 Pro IMEI, Baseband, MAC, NVRAM WARNING, or NVDATA CORRUPTED

You can use SP Flash Tool, TWRP, PBRP, DD, ADB Fastboot, MTK Droid Tool, or any other tool that you want. Here we’ll gonna use SP Flash Tool as the Poco M4 Pro has a MediaTek processor.

Pre-Requisites:

Make sure to follow all the requirements properly to successfully fix the issue on your Poco M4 Pro (evergreen / fleur).

1. You Need a PC or Laptop and a USB cable

First of all, you’ll require a Windows desktop/laptop and a USB cable to easily connect your Poco M4 Pro (evergreen / fleur) handset with the computer. It’s necessary.

2. Charge Your Phone

Make sure to charge your device battery sufficiently (more than 50%) to avoid any kind of occasional shut down during the unbricking process.

3. Create a Scatter file from Firmware

You can check out this guide link to easily do so.

4. Download Xiaomi USB Drivers

Make sure to download the Xiaomi USB driver and then install it properly on your computer. A USB driver is always required to easily connect to a handset with the computer for a successful data transfer or flashing files, etc.

5. Download SP Flash Tool

You’ll require the SP Flash Tool to be installed on your computer. [Important]

5. Download Firmware

If you need the firmware file, head over to our link to find the Poco M4 Pro flash files.

Steps to Restore or Fix IMEI, Baseband, MAC, NVRAM, NVDATA

• Open your Scatter File and search for NVRAM.
• Rename the file from none to NVRAM.img and is_download: as from False to True.
• Run the SP Flash Tool on your PC.
• Select the Scatter File for your device.
• Here, select only the NVRAM.img file.
• Now, turn off your Android Device and connect it to your PC via a USB Cable.
• Click on the Download button.
• Once the flashing process is completed, disconnect your Android Device and turn it back on.
• That’s it! You have successfully restored your IMEI/ NVRAM Backup.

Partition Details with Screenshots

Keep in mind that you’ll have to use the same block, start address, and length as mentioned below.

1. Partition: nvcfg​

• Description: This partition stores variable configs of NVDATA and NVRAM.​
• Size: 32.768 KiB (32 MiB)​
• Block: /dev/block/mmcblk0p11​
• Start address: 0xa4a2000​
• Length: 0x2000000​

2. Partition: nvdata​

• Description: This partition stores variable data of secure and identifying info for your device. Like IMEI, WiFi MAC, Bluetooth MAC, calibration data, and others.​
• Size: 65.536 KiB (64 MiB)​
• Block: /dev/block/mmcblk0p12​
• Start address: 0xc4a2000​
• Length: 0x4000000​

3. Partition: nvram​

• Description: This partition stores persistent data of secure and identifying info for your device. Like IMEI, WiFi MAC, Bluetooth MAC, calibration data, and others.​
• Size: 65.536 KiB (64 MiB)​
• Block: /dev/block/mmcblk0p21​
• Start address: 0x19f00000​
• Length: 0x4000000​

4. Partition: persist​

• Description: This partition stores persistent data for factory reset protection. Like Google account and Mi Account/Mi Cloud.​
• Size: 49.152 KiB (48 MiB)​
• Block: /dev/block/mmcblk0p13​
• Start address: 0x104a2000​
• Length: 0x3000000​

5. Partition: proinfo​

• Description: This partitions stores persistent data of default structure for NVRAM/RADIO/MODEM/BASEBAND.​
• Size: 3.072 KiB (3 MiB)​
• Block: /dev/block/mmcblk0p19​
• Start address: 0x18200000​
• Length: 0x300000​

6. Partition: protect1 (or protect_f)​

• Description: This partition stores variable data of SIM/RADIO/MODEM/BASEBAND settings and info.​
• Size: 8.192 KiB (8 MiB)​
• Block: /dev/block/mmcblk0p15​
• Start address: 0x164a2000​
• Length: 0x800000​

7. Partition: protect2 (or protect_s)​

• Description: This partition stores variable data of SIM/RADIO/MODEM/BASEBAND settings and info.​
• Size: 11.640 KiB (11,36 MiB)​
• Block: /dev/block/mmcblk0p16​
• Start address: 0x16ca2000​
• Length: 0xb5e000​

How to Take a Backup of IMEI/ NVRAM via SP Flash Tool

Once the restoration process is completed, you should take a backup of the restored IMEI/Baseband/NVRAM, etc for future reference. Make sure to back up the listed partitions mentioned above. To do so:

• Open your Scatter File and search for NVRAM.
• Now, note down the values of ‘physical_start_addr:’ and the ‘partition_size:’.
• Open the SP Flash Tool on your PC > Select the Scatter File for your device.
• Then click on ReADBack.
• Click on Add and double-click on the created file.
• Select any folder where you would like to save the backup file and click on save.
• Now, enter the previously noted down ‘physical_start_addr:’ and the ‘partition_size:’ values into the Start Address and the Length text fields respectively.
• Click on the OK button and then click on the Read Back.
• Connect your Poco M4 Pro device to your PC via a USB cable.
• Wait for the reADBack process to get completed.
• Once the process is completed, you’ll get the Backup file ‘NVRAM.img’ in the selected folder.
• You’re good to go.

That’s it, guys. We assume this guide was helpful to you. For further queries, you can comment below.

However, if you’re facing issues with the VBMETA or NULL IMEI or even an invalid Baseband issue on your Poco M4 Pro (evergreen / fleur) then you can visit the XDA link below to ask for help.