Yarns FW Update: Data is not received

Hi and thanks for approval. I’m having a hard time updating yarns. When I set it to update mode (cycling 0s) and try to send the sysex file via Sysex Librarian nothing happens (also tried C6 and different timings). No data is received at all. The 0s keep cycling. Using the same midi connection in normal mode works just fine. Any ideas what I could try to make it work?

My Setup:
Emagic Unitor 8 > Midi > Yarns

Thanks in advance!

A different MIDI interface? some have trouble with sysex.

thanks for the tip. I tried all my devices now. unfortunately with the same result.

Have you successfully sent sysex with same setup previously?