Here we are sharing a very comprehensive tutorial along with a video guide to restore IMEI on all Mediatek chipset based devices. The advantage of this method is your phone doesn’t need to be rooted to perform this task. With this guide, you never need to worry about IMEI. This will permanently restore your IMEI. This tool supports major MTK chipsets such as MT6592, MT6582, MT6589, MT6577, MT6575 and this tool has been tested with many MTK phones.
What happens when you lose your IMEI? :
In a Mediatek chipset based Android phone, your IMEI is written in /data/NVRAM region. This NVRAM region gets erased when you lose your IMEI.
  • PC
  • Minimal ADB & FastBoot Tool
  • CDC drivers ( Can be downloaded from our Downloads section )
  • Maui META 3G Tool ( Can be downloaded from our Downloads section )
  • Phone charged up to 30-40% minimum
  1. adb devices
  2. adb pull /etc/mddb C:/programfiles 
(originally adb pull "location of file on device" "location where you want to copy file")

Watch This Video To Full Guide How to Create NVRAM 
(BPLGUInfoCustom) Database File TO FIX IMEI Issue

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Unknown said... 12 June 2019 at 01:03

Etc/mddb does not exit use for vivo y81i

Unknown said... 29 April 2020 at 19:58

Etc mddb?does not exit.....