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Are you using an Apple device? I get the same error message if I try to update the firmware using my iPhone and/or my iPad. However, if I use my Samsung S8+ phone, it works with no problems. This morning, I was able to update my WT24-0001 Indoor timer from 0020 to 0026. It now says “Your device is up to date.” when I check it using the S8+. The iPad and iPhone still say “Update Failed: The update version specified was invalid.” This suggests a bug in the iOS version of the software.