Kestrel Instruments Support & FAQs

What is the difference between the NK Bootloader, the AB Profile Loader, and the HK Gunloader?

  • NK Bootloader- This is used exclusively for updating the firmware on the most recent Kestrels. This Bootloader will work with serial numbers 686705 and above. Serial numbers below 686705 cannot be updated.
  • AB Profile Loader - This is the application used for creating and uploading gun profiles for the Kestrel Shooter's Weather Meter with Applied Ballistics.
    • Build 24 - used for firmware version 4.76 or below
    • Build 33 - used for firmware versions greater than 4.76
    • Build 70(or higher) - used for firmware version 4.93
  • HK Gunloader - This is the application used for creating and uploading gun profiles for the Kestrel Shooter's Weather Meter with HORUS Atrag.