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Cause of problem issue as far as I know in my experience. The NVRAM file firmware needs to flash to phone to prevent this problem. Write a 15 digit IMEI number same as your phone using IMEI tool. If the problem is 'Invalid IMEI' but has a good Baseband in About menu of the device.ġ. If a problem still, Its a module Baseband Hardware problem. Use the Paid tools or Free tool to Fix it, Unknown baseband buttonģ. Restore factory setting on the menu of the phoneĢ. However, if you’re facing issues with the VBMETA or NULL IMEI or even an invalid Baseband issue on your Xiaomi 11T (agate) then you can visit the XDA link below to ask for help.After writing a Good NVRAM database to the device If this is still 'U nknown Baseband', Try the following I made in my experience.ġ. For further queries, you can comment below. Once the process is completed, you’ll get the Backup file ‘NVRAM.img’ in the selected folder.Wait for the reADBack process to get completed.Connect your Xiaomi 11T device to your PC via a USB cable.Click on the OK button and then click on the Read Back.Now, enter the previously noted down ‘physical_start_addr:’ and the ‘partition_size:’ values into the Start Address and the Length text fields respectively.Select any folder where you would like to save the backup file and click on save.

Click on Add and double-click on the created file.Open the SP Flash Tool on your PC > Select the Scatter File for your device.Now, note down the values of ‘physical_start_addr:’ and the ‘partition_size:’.Open your Scatter File and search for NVRAM.Make sure to back up the listed partitions mentioned above. Once the restoration process is completed, you should take a backup of the restored IMEI/Baseband/NVRAM, etc for future reference. Image Credit: XDA How to Take a Backup of IMEI/ NVRAM via SP Flash Tool Description: This partition stores variable data of SIM/RADIO/MODEM/BASEBAND settings and info.​.Description: This partitions stores persistent data of default structure for NVRAM/RADIO/MODEM/BASEBAND.​.

Like Google account and Mi Account/Mi Cloud.​