According to CoPilot your FIR file need to be converted before upload to HypexFilterDesign. According to CoPilot Hypex Filter Design require another format,
✔ exact 1500 coefficient
✔ one float per line
✔ no header
✔ no metadata
✔ no frekvenskolumn
✔ no timeskolumn
✔ no scaling‑tagg
✔ no DC‑compensationtagg
Please, inform if Your FIR file fulfills the HypexFilterDesin and can be uploaded without any additional conversion
