Kenwood TH-74 Firmware has been updated from Version 1.09 to Version 1.10 

Firmware update informationLast updated : October 30, 2019

The TH-D74A/E firmware has been updated from Version 1.09 to Version 1.10 as follows.
We are offering the firmware updating program to the TH-D74A/E owners.
You can update the TH-D74A/E firmware by connecting the TH-D74A/E to the PC by using a Micro-USB cable.

About virtual COM port driver for the TH-D74A/E

A virtual COM port driver needs to be installed onto the PC to use the firmware updating program with a Micro-USB cable.
ATTENTION:Do not connect the transceiver to a PC using a Micro-USB cable before installing the virtual COM port driver.

Updated items : (Version 1.09  1.10) [October 30, 2019]

The following feature is updated.

1. APRS «Tune» (QSY) operation sets D-STAR gateway communication when D-STAR repeater information is included in the QSY information of the received APRS packets even if without frequency information.
The update is based on a revision of the QSY format. For details, please refer to the following web page by WB4APR Mr. Bob Bruninga (updated on September 30, 2019).

The following symptoms are revised.

1. APRS message line number may not be backed up when turning the transceiver off.

2. APRS telemetry packets may not be displayed correctly


Applicable models/units :

The firmware updating program is applicable for the following models/units.

Models: TH-D74A, TH-D74E
Serial numbers: From S/NO.B68xxxxx through S/NO.B9Axxxxx approx.

Notes: You can find the serial number imprinted on the rear panel after removing the battery.; It consists of an 8-digit number beginning with «S/NO.»

: You can check the firmware version of your TH-D74A/E by accessing Menu No.991.
The firmware version appears in the LCD display.

Operating Environments

1. Operating System (OS)

Windows® 7 (32-bit or 64-bit)
Windows® 8.1 (32-bit or 64-bit)
Windows® 10 (32-bit or 64-bit)


This software is designed to run on the above operating systems.

Applicable operating systems are subject to change without notice due to the end of the technical support by Microsoft Corporation or change of the product specifications.

The .NET Framework 4.6 which is available for download from Microsoft download center must also be installed. (Windows® 10 users do not need to install the .NET Framework.).

2. Processor

Faster than the recommended CPU for each OS.

3. System Memory (RAM)

Larger than the recommended System Memory for each OS.

4. Free Hard Drive Space

Larger than the system Hard Drive Space for each OS.

5. Peripheral Devices

A display with resolutions higher than VGA (640 x 480)

A keyboard and a mouse, or other pointing devices.

USB 2.0 interface.


If you do not want to lose user data, save the data using the Memory Control Program MCP-D74 before updating the firmware and write the data back after updating the firmware.

Turn the transceiver OFF before connecting it to a PC.

You cannot connect the TH-D74A/E to a PC COM port via an RS-232C cable.

Notes on usage

Users are prohibited to assign, rent, lease, redistribute, or resell the software.

Users are prohibited to revise, change, translate, merge, de-compile, or reverse engineer the software.

JVCKENWOOD Corporation does not warrant that quality and functions of this software comply with each user’s purpose of use of this software, and unless specifically described in this document, JVCKENWOOD Corporation shall be free from any responsibilities to any defects and indemnities to any damages or losses. Selection and installation of this software shall be done by the user’s own designation. The user shall take full responsibility for the use and effects of this software.

JVCKENWOOD Corporation shall be free from any responsibilities for any incidental losses or damages, such as missing communications or a call opportunity, caused by a failure or performance error of this software.

JVCKENWOOD Corporation shall own all copyrights and other intellectual properties for the software and all manuals and documents attached to the software. The user shall be allowed to use, not to resell, the software by obtaining a license from JVCKENWOOD Corporation. While the media on which the software is stored is possessed by the user, the ownership for the software itself shall be reserved for JVCKENWOOD Corporation.


Extract the downloaded file «» into a designated folder.
In the designated folder, a folder labeled «TH-D74_V110E» will be created.
In the folder labeled «TH-D74_V110E», two files «TH-D74_V110_e.exe» and «TH-D74_e.chm» are automatically created.


1) Start the program by double-clicking «TH-D74_V110_e.exe» icon.

2) Connect the transceiver’s USB port to your PC’s USB port using a Micro-USB cable, and select the COM port you will use by following the Help file.

3) Proceed firmware updating by following the explanations in the dialog boxes.


Delete the folder labeled «TH-D74_V110E» manually using the Explorer or an alternative method.
This software does not modify the system registry parameters or system folder.

If you agree with the details listed above, click the following link to download the firmware updating program.

(The latest version includes all previous updates.)

TH-D74 Firmware Update Version 1.10 (October / 2019) : 7.65MB download

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