Dell inspiron 15r bios update is not required though, if you have your laptop working well and up to the mark.

Dell inspiron 15r bios update to a higher version or the latest one that comes with the company specifications can find replacement to the creepy bios already in use.

All you need is to have a latest BIOS update which can be downloaded online.  Then you got to run the CD, on which the bios image was loaded and then reboot the laptop. This should work for you.

You can also have the bios file saved on the hard disk and then try executing it, while you restart the laptop in safe mode. Your 15r laptop would then be able to go into bios settings.

What really makes you go with the dell inspiron 15r bios update could be annoying bugs that you encounter in the OS, or the hardware Bios switch that has unfortunately gone bad.