Yaesu FT-891 Firmware Update Manual page 4

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How to Update the MAIN Firmware

Preparation: Download the YFSW023 transfer software, and the AH065_M_V****.SFL firmware, to the

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

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

from the transceiver unit.

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 on the PC before connecting the USB cable.)

3. Move the programming slide switch (located on the rear panel of the transceiver) toward the left side (use

a pin).

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.

This puts the transceiver into programming mode (the display will be blank).

NOTE: Do not touch the transceiver POWER switch.

6. Execute the YFSW023 transfer software on the PC.

7. Click the [ Configure ] button on the YFSW023 transfer software screen, and set the COM port number.

(Use an Enhanced COM port when using a USB cable. Please see "FT-891 Virtual COM Port Driver" on

the Yaesu Website for details (http://www.yaesu.com/)).