fermware up dateing

I have just bought a second hand Nikon b700 and it has not ever had a fermware update. I have tried several times and not got it to see the file on the camera. Having looked on lots of places it seems to be a problem to lots of us. Am I missing something? I have down loaded the up date file to my laptop. I have formated the card in the camera. I have transfered it to the card I am not sure if this part is done in the right way. I put the card back in to the camera switched it on and gone into the menu to fermware and the new fermware is not visible it only shows the origanal 1.1 fermware. The battery is fully charged as this is said to importent. Can anyone help please? Roly