Need help in resetting the BIOS password

Hi All,

I am using Dell Inspiron 5547 laptop and a month back I set BIOS password, which was working fine till last week. 

Recently my laptop took automatic updates and during the restart the updates got installed. Ever since these updates my laptop is not accepting the BIOS password. 

I am sure, I am using the correct BIOS password, however it is not accepting it.

Is it a know issue in Dell Inspiron 5547? Why I am asking this question is I found quite a few similar complaints against this model.

Can someone help me with this issue?