At the first of this post, I would like to give full CREDIT of this solution to ‘Nishroy’ on whose post I have developed this step-by-step guide. I have used the same on my A110 and sharing the steps that I have followed.

Prerequisites:
On Mobile : i) it must be rooted ii) it must have root file explorer installed (i used ‘Total Commander’ – you can download it from Play store).
On Computer (Desktop/Laptop) : A stable Hex Editor Application. I used ‘HxD – Hexeditor Ver. 1.7.7.0’ on my laptop running on Windows 8 64 Bit OS.

Step wise Guide

Step # 1 : Switch on WiFi adapter on your phone.
Step # 2 : Go to ‘About Phone’ from Settings and note your phone’s Wi-Fi MAC Address mentioned there. It should lok like xx:xx:xx:xx:xx:xx (xx = value of Mac Add.)
Step # 3 : Switch off WiFi adapter on your phone
Step # 5 : Launch ‘Total Commander’ application on your phone and navigate to File system root/data/nvram/APCFG/APRDEB and copy one file named ‘WIFI’ from there to the SD Card of your phone
Step # 6 : Copy this file i.e. WIFI from your SD card to Desktop on your laptop/desktop
Step # 7 : Launch ‘HxD-Hexeditor’ on your laptop/desktop and click on OPEN or Ctrl+O and select WIFI file (copied as per Step # 6) from desktop
Step # 8 : Refer to the first raw in the opened file and go to column no. 04
Step # 9 : Insert value of your actual MAC Address (as per Step # 2) in column 04 to 09 (Ensure that none of the value is ZERO) and SAVE this change
Step # 10 : Close Hexeditor and copy changed WIFI file from your desktop to the SD card of your phone. Delete older WIFI file from SD Card before copying this file.
Step # 11 : Once the file is copied to SD card, launch Total Commander application and move this file from SD card root to File system root/data/nvram/APCFG/APRDEB
Step # 12 : Reboot your phone

Your phone’s WiFi NVRAM Error is gone now. Yes, you solved it.