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But when the download is finished, the factory default program begins to run (instead of my hardware design).
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As he wrote, after the download the wrong image starts.
if you download an image with quartus programmer for example, then the fpga starts with this image.
now he says the old image is used, so i assume that he downloads the old (already programmed) image.
do you have a web edition ? have a look at the files. if you use a web edition the sof file name has "time_limited" or something like that in addition to the file name. so check if you create a time limited sof but programm the non time limited sof file.
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