Needed to transfer the downloaded update file to a new digital camera. Used it to format a CF express memory card at a low level and then easily transferred the file from my Windows 10 laptop to the memory card. Then I moved the card into the camera, which read the file with no problems and did a successful update. I can't comment on overheating issues as it hasn't been used for a very long time, but the card reader stayed at room temperature in that short amount of time. The reader looks well made and is definitely the right price. I definitely recommend this product.
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