in fact I did a downgrade of the software to v.2.54 and back to 2.60. Then all my presets were unreadable. So i did a factory reset, installed the new HX Edit and downloaded some IRs.Then I started to edit the presets from the beginning with HX Edit. After 5 presets suddenly the HX didnt respond to any button again. But I still had the chance to do a backup. So I did a Factory Reset again, reinstalled the Software v.2.60 and restored the backup. Just now its running.