I went through the firmware upgrade process yesterday for the GX-10 and thought of precautions to take before, that are not usually mentioned. The firmware upgrade has the potential to turn your camera into an expensive paperweight.
1. Verify the size of the bin file before upgrading to make sure it is complete. MD5 hash is the best method - note that neither Samsung nor Pentax provide a MD5 checksum, so you'll need to get it off someone that has succesfully upgraded. An alternative is to make sure the size of the file is as reported on the website.
2. Format the SD card in camera - this is to avoid issues with reading the bin file halfway through the upgrade process.
3. Battery fully charged, also connect AC adapter if you have it. This is to avoid power loss halfway through the upgrade.
4. No kids, babies or pets in the room.
5. Ensure that the bin file is the only one on the card, don't place in a folder, there should be no folders in the SD card. Remove the card a few times from the card reader and verify each time that the file is there and reports the same size. Use the "safely remove hardware" before ejecting SD card from card reader. Wait for any lights to stop flashing.
6. Use your most reliable SD card - no ebay cheapies please.
7. Before you start, have a think about the features the firrnware upgrade gives you or the bugs it fixes. Do you really really need the features or bug fixes? Don't upgrade the firmware until you really need to. Beware that each new firmware revision has the potential to introduce new bugs. I strongly advocate not running the latest firmware as soon as its released.
8. Place the camera on a level non slip surface to prevent it falling during the upgrade, and either knocking the power cable or the battery loose.
9. Stay and watch the progress of the upgrade, however nerve wracking this feels. If there is a problem with the upgrade you have a better chance of doing something about it, if you are there. You will also have to be able to describe any error messages to the camera technician if it goes pear shaped.
10. Follow the upgrade instructions to the letter. If you do not understand any part of the instructions, seek clarification before proceeding. Samsung has got excellent instructions at:
Samsung Digital Camera
Pentax's instructions are contained in a text file, but the procedure is identical to the Samsung.