[N55U] Factory Reset to stock

Hi,
I have been having some issues for some to time now, I dont want to put you all to sleep with the story.

But basically I just need some help with some commands to reset my device to factory stock.

I have really no knowledge with telnet / putty. As far as what I have tried is the following.

Reset router externally ( reset button / recovery mode / firmware reinstall ) also done a telnet/putty login and did a clear nvram command.

But still experiencing the same issues, but it might be...

[N55U] Factory Reset to stock