To check the Ricoh Caplio R5 firmware version, with the camera off, set the mode dial to Video then:
Hold the macro / down button, and hold the Play button at the same time.
(You can use the power button at this point, whilst still holding the other buttons, if you want if it doesn't switch on automatically) This will / should switch the camera on and display the full Firmware information.
Mine is:
Main: 1.22
BKUP: 1.00
MONI: 1.00
ADJD: 1.22
EXTD: 1.04
CPU1: 1.00