I just fixed a friends Pentax Optio S4i.
You want to extract this file.
File name : O4IE101W.EXE
Format your SD card in my computer. Open the O4IE101W.EXE on your desktop. It makes the file fwdc124p.bin. Put the fwdc124p.bin on the SD card.
I did save this file on the flash card.
Then I fully charged the battery (I got this from the Pentax site)
I opened the "secret menu" by pressing the MENU-FLASH and the POWER button at the same time.
Once menu opened, I pressed the FOCUS twice then (FLOWER, MOUNTAIN, MF) symbol twice after this two toggles to the right with the OK button.
Then press the MENU button once again.
So the menu screen open now.
Down toggle of the OK button, go to ROM UPDATE then go down to "SYSTEM INITIAL" and press OK. Press another OK to re-initialize your camera.
Once this has been done, turn your camera off.
Turn camera on again opening your camera with the MENU+Power ON procedure...finally this should be posting "Complete" after the "Loading"
When it shows Complete, turn camera off.
You are finished and your camera should be ready to work again.
At least this is how I fixed my friends A90 error message.
The firm ware is here:
http://www.pentaximaging.com/support/manuals-and-literature/
navigate to your camera
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