Originally posted by cardinal43 I have the K100D but I can't remember the firmware number (I'm at work), but I had to upgrade it to use a 4gb card. Found out the hard way after I bought the card and it couldn't read it. I've had absolutely no problems with the camera since the firmware upgrade. Upgrade took about a minute to do.
From the Pentax Imaging site it was Firmware Version 1.02.
Version 1.01 made it support SDHC but then version 1.02 had it improved SDHC support.
From what I have read and heard, you don't have to install version 1.01 first then 1.02. You only have to install version 1.02 'coz it automatically has 1.01 with it.
Anyway, just check pentax imaging and go to "support" then "self support".
After that, you go to firmware "historic product" and select K100D.
Read at what's there and download the firmware update and just follow the instructions/procedure.