ImageMagick 6.9 convert not possible

Hello,
i reinstalled my dietpi Software a few days ago and now one of my script don’t work any more.
In that script i download a GIF File from an Webserver and convert that to JPG and send it to another Webserver.
But since i reinstalled the Convert only gives me this Message back:

root@rpi:/media/cam# convert summary.gif test.jpg
convert-im6.q16: improper image header `summary.gif' @ error/gif.c/ReadGIFImage/1046.
convert-im6.q16: no images defined `test.jpg' @ error/convert.c/ConvertImageCommand/3258.

I also use the same image than i used before, could someone help me here?

Linux rpi.home 5.10.17-v7l+ #1421 SMP Thu May 27 14:00:13 BST 2021 armv7l GNU/Linux

well I’m not sure what your issue is but it seems the image you download is corrupted as you have a message about improper image header