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Glad to hear you figured it out. The recovery will only show zip files.
Its still very strange that it had an extension at the end. How did you download it and where did you download it from?
I wonder if the .goodownload is just a temporary extension for the download in progress? Having failed, it did not delete the data it did download but never made it to the point of renaming back to .zip once completed. The easiest thing would be to check the file size, and then MD5 if they are the same size before flashing. It's a bad idea trying to force something to flash
Ahh, I read the extension as "good download"
Makes much more sense now