J04264: DAD failed wavelength calibration. Verification and Intensity Test. Ordered and replaced DAD Optical Unit. Refresh the firmware to B.07.20. Perform wavelength calibration. Verification & Intensity tests passed using both maxlight cartridge test cell as well as customer's flow cell G4212-60007. New Optical unit require new upgrade firmware in order to work with test flow cell due to RFID changes.