Yaesu FT-891 Firmware Update Manual page 7

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How to Update the DSP Firmware

Preparation: Download the YFSW023 transfer software, and the AH065_V****.dat firmware, to the

same folder on the PC, and Unzip the downloaded zip file.

1. Confirm that the transceiver is turned OFF. Then disconnect the DC power cord, and all other cables from

the transceiver.

2. Use a standard, commercially available USB cable, to connect the transceiver USB terminal and the PC

USB port.

(The FT-891 virtual COM port driver must be installed before connecting the USB cable.)

3. Confirm that the programming slide switch (located on the rear panel of the transceiver) is set to the right

side.

4. Confirm that the external power supply is turned OFF, and then connect the DC power cord to the

transceiver.

5. Turn the external power supply ON.

6. Press and hold the [PWR/LOCK] key while pressing the [F] + [C] keys on the transceiver main panel, to

turn the transceiver ON in the DSP programming mode.

The below message will appear on the transceiver display.

7. Execute the YFSW023 transfer software on the PC.