@Jimfixer, @Cameron
Good morning and many thanks for your quick reply. I tried all the said methods and the method as pointed by Jimfixer.
The solution which worked for me is amazingly great. I used [https://bios-pw.org|https://bios-pw.org] This worked for me beautifully. '''NO MONEY. IT IS FREE.'''
I am sure that the same solution will work for other Dell laptops as well.
Thanks again for your prompt help.