Click on "MT4300 update.zip" follow the screen prompts to download it to your PC. Save it to a folder or your desktop.
Once downloaded you will need to unzip or extract it.
With your MT4300 connected to your PC using the USB cable double click the file MT4300 updated.
The program will detect the MT4300 and begin the update process.
If you are using your MT with the TargetKey system when asked " Do you want to transfer User ID" answer YES other wise NO.
Remember to set your channel again. After the update channel is set to zero.
Remember your password has also been set to the default of 1234. Change this to your own password in system setup.