<p>Hold the DISP/BACK button while switching on. That will show the firmware version of the body and the lens, providing one is mounted. For other lenses you will have to mount that particular lens. A list of current firmware versions is on the Fuji website. Yes, when the camera has the current version you only need to update the lens firmware. As a matter of fact it is not possible the update firmware when it is the current version. Do not worry. Reading the instructions it looks quite complicated, but in real life it is quite easy to check and update Fuji firmware.</p>