Visit sometimes G550 C900 website we recommend. It will help you to use your Optio A40 hardware to the fullest Pentax extent.
There, you can download the latest Optio A40 updates of firm ware and G550 C900 drivers for your 5800 XpressMusic device. You can also create Photosmart C5380 restore points of your system in case of program failure. You would be able to retrieve initial state easily and try installing a Optio A40 driver one more time. If you have an outdated 5800 XpressMusic unit, you won’t be able to find the matching Optio A40 driver thereto.
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