Note there is different firmware for the K5 vs. K5ii
http://www.ricoh-imaging.co.jp/english/support/download_digital.html
Provide a formatted SD memory card for the update software.
The download file is self-extracting.
Copy the above Firmware file to the root directory in the SD card.
If your computer does not have a card slot, you can copy the firmware update file by inserting the SD card into your camera and then connecting the camera directly to your computer.
Insert the D-LI90 battery into the camera and confirm the battery is full by battery level indicator then turn the camera off.
Insert the update SD card (prepared in step 1) into the camera (slot 1) and close card cover.
Turn the camera power on while pressing the MENU button.
"Updates the camera firmware" appears in the LCD monitor.
Ver: 1.00/1.01/1.02/1.03 /1.10 / 1.11/1.20/1.21/1.30/1.40/1.41 →1.42 will be displayed.
Press the four-way controller to select "Start" and press the "OK" button.
"NOW LOADING" appears on the LCD monitor and updating starts.
Please do not under any circumstances switch off the power before the update is completed.
When update is completed, the "COMPLETE" will be displayed at the left bottom of the LCD monitor, then turn the camera off.
Remove the update SD card from the camera.