For so many reason  android user encounter this IMEI/unknow based version error after flashing a rom or after factory reset today we will be give you the best method to fix this bug when you encounter it  this guide applies to all MTK mediatek device

How to fix unknown Baseband version, null/invalid IMEI &  SIM card not detected

Thing You Needs
Use any of the NVRAM backup
After downloading the required file you need launch your Es File explorer click the menu of this and enable Root Explorer
Click on the Sdcard0 that is your external Sdcard  location the NVRAM file you download

Extract it using Es zp Viewer
Click that icon at the top to extract the folder to any folder you want
Copy  the NVRAM folder  navigate to the device as seen in the picture below

Click the data folder to open it up

Paste it, it will ask you to overwrite the NVRAM folder click overwrite

Now close es file explorer and Reboot your device.
When ur device is finally booted, your invalid imei and unknown baseband version would be fixed


    • please be specific when making comment am no magician to understand what you mean.
      All zip files are good you are having that error maybe your download was not complete

  1. Yes i agree the link is working just pretty fine but the problem is the file within the link"nram backup 27.9kb" i tried to open it in both pc and phone says bad archive zip cannot open.


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