Instructions for Software Upgrade - Mitsubishi

Software Update Instructions for Model LT-55154
Since this model is “Internet-capable”, there are two (2) different methods for updating this model:
1. If the unit IS connected to the internet
2. If the unit IS NOT connected to the internet.
If the unit IS connected to the internet, the update will install automatically, as long as; A) There is an update
available, and B) the TV is turned off for at least 30 minutes.
IMPORTANT NOTE:
If the installed version on your TV is 12.01, you
MUST connect to the internet to install the
update. Version 12.01 can NOT be updated via
USB.
If the unit IS NOT connected to the internet, (and the currently installed version is 12.02 or higher) follow the
instructions below.
This software update procedure consists of three (3) steps:
A. Re-Formatting the USB Mass Storage device.
B. Downloading and Extracting the Software Update file.
C. Installing the Software Update.
Quick Instructions (text only) are shown below, Detailed Instructions are shown on the following pages.
*****************************************************************************************
Quick Instructions
A. Reformat a USB Mass Storage Device (128MB minimum, FAT32)
(If you require assistance with this step, please click HERE.)
B. Download, then extract the software update file to the USB Mass Storage Device.
(If you require assistance with this step, please click HERE.)
C. Install the Software Update
1. Turn on the TV.
2. Insert the USB Mass Storage device into the USB slot labeled “USB”, located on the side of the TV.
3. Wait for a message to appear on screen stating that there are no media files.
4. Turn off the TV.
5. Wait 30 minutes. During this time, do not turn on the TV, unplug the TV, or unplug the USB Mass Storage
device.
6. After 30 minutes, turn on the TV.
7. Remove the USB Mass Storage device.
8. The TV is now ready for normal use.
Page 1 of 5
Please call 1-800-332-2119 for assistance
(Quick Instructions complete)

Detailed Instructions
A. Re-Formatting the USB Mass Storage device
To perform this software update, you must have a FAT32 formatted (MS-DOS for Macintosh users) USB
Mass Storage device with 128MB or higher capacity. The USB Mass Storage device must be re-formatted
prior to use. WARNING: All files that exist on the USB Mass Storage device will be deleted. Transfer
any files that you want to keep to your hard drive before proceeding. Mitsubishi Digital Electronics
America is not responsible for any loss of personal files.
1. Plug the USB Mass Storage device into your computers USB port.
2. Open “My Computer”. This will open a window showing all current drives on your computer.
3. Right-click on the drive letter associated with the USB Mass Storage device. Select “Format...”.
Step 2 - My Computer
Step 3 - Right-click on “Removable Disk”
4. A formatting dialog box will appear; under the “File system” option, make sure that “FAT32” is selected,
then click on the “Start” button. All other options are user definable.
5. You will receive a warning message; click on the “OK” button.
6. After a few moments, you will receive a message stating that the formatting is complete. Click on the
“OK” button.
7. Close the formatting dialog box by clicking on the “Close” button. Re-formatting is complete.
Step 5
Step 4
Step 6 Step 7
Page 2 of 5
Please call 1-800-332-2119 for assistance
(Re-Formatting complete)

Detailed Instructions
B. Downloading and Extracting the Software Update file
You must have a de-compression (un-zipping) utility application (such as WinZip) installed on your computer.
1. Double-click on the software update file link; Depending on the internet browser in use, you will be
prompted to open or save the file. Select “Open”. Then click on “OK” if using Firefox. A downloading
progress box will appear, again based on your internet browser.
Step 1 -Using Windows Internet Explorer
Step 1 - Using Firefox
2. A message box (based on your computer’s un-zipping utility application) will appear. Select “Extract”.
Page 3 of 5
(Downloading and Extracting continued)
Please call 1-800-332-2119 for assistance

Detailed Instructions
B. Downloading and Extracting the Software Update file
3. High-light the drive letter location for your USB Mass Storage device (it is normally referred to as a
“Removable Disk”), then select “Extract”.
4. An extraction progress box will appear; when it has completed, a window will open showing the contents
of the USB Mass Storage device.
Extraction Progress Box
Contents of USB Mass Storage device
5. You may remove the USB Mass Storage device from the USB port at this time. Some operating systems
such as Windows 98 or Windows 2000 may require that you stop the USB Mass Storage device prior to
removal from the USB port. Downloading and Extracting is complete.
Page 4 of 5
(Downloading and Extracting complete)
Please call 1-800-332-2119 for assistance

C. Installing the Software Update
1. Turn on the TV.
2. Insert the USB Mass Storage device into the USB slot labeled “USB”, located on the side of the TV, as
shown in Figure 1.
3. Wait for a message to appear on screen stating that there are no media files. See Figure 2.
Figure 2
4. Turn off the TV.
5. Wait 30 minutes. During this time, do not turn on the TV, unplug the TV, or unplug the USB Mass Storage
device.
6. After 30 minutes has elapsed, turn on the TV.
7. Remove the USB Mass Storage device.
8. The TV is now ready for normal use.
Page 5 of 5
Please call 1-800-332-2119 for assistance
(Software Update complete)