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Most smart TV update their firmware online when on the internet.
There is no file as such to download and apply from outside.
On my LG smart TV it is
Settings > ? > Software Update > Check Update Version
It displays if there is an update available or
it displays the current version and
I can also checkmark Automatic update mode UPDATING YOUR FIRMWARE
Here is some help on a Sharp Aquos. You pull the plug and update manually.
Sharp Aquos Firmware Update Issue and Resolution
I recently had problems with my Sharp Aquos LC-60LE632U and firmware update 311U1204061. When I attempted to run the Netflix app, I was told that I couldn't proceed unless I updated the firmware. After 2 attempts to update the firmware via the network, I turned to Google and found that this was a common problem. In order to resolve the issue, you'll need to update the firmware manually, via a USB thumb drive. See the following instructions:
Before updating the firmware, you should know about the version of the firmware now running with your TV. Without knowing it, and updating the firmware; might cause the set to get irresponsive to any external commands. So beware before updating. After make sure about the firmware now running, check the site linked here to get latest firmware update to your TV. It will be best to contact any service technician in this case, I suggests. Electro help Olevia Driver Firmware Manual
Click "Product Support" in the menu along the top of the home page. The Product Support drop-down menu opens.
Select "Televisions" beneath Choose Category.
Select your type of Toshiba TV beneath Choose Family. For example, options include 3D TV, LCD TV and LED TV.
Select your Toshiba TV model beneath Choose Model.
Click the red "Go" button to the right of the Choose Model section after selecting your Toshiba TV model. The product support page for that specific TV model will be displayed.
Select the "Downloads" tab. If there are no downloads available for your TV model, either your won't be able to click the tab or there will be a message within the tab that says there are no downloads at this time. If this is the case, no firmware updates are available for your Toshiba TV. Check back periodically, as firmware updates are released as needed and aren't scheduled.
If there is content in the Downloads section, look in the Category section for an item titled TV Firmware. If this option doesn't appear, no firmware update is available. However, if this option does appear, click the clickable link associated with the firmware. The TV Firmware Update and Release Notes dialog box appears. In this dialog box you can see the size of the firmware update file, when it was released, exactly what it addresses and more.
Click the red "Download Now" button and save the file to your connected USB flash drive.
Extract the contents of the ZIP file on the USB flash drive.
Disconnect the USB flash drive from the computer after the firmware update file saves successfully to the device.
Power on the Toshiba TV and then connect the USB flash drive to the USB port on the Toshiba TV.
Wait a few moments for the "Firmware file is detected in USB" dialog box to appear on the screen. Select "Yes" to update the firmware. A progress bar displays on the screen. Be careful not to turn your TV off while the firmware is updating. The progress bar changes to a "Success!" message after the update successfully installs.
Disconnect the USB flash drive from the TV and then restart the TV. After the TV restarts you can resume using the TV as you normally would.
Your tv will update firmware automatically, it may warn you not to shut it down during the process. However having said that if you go into your main menu, you will see a first time startup option, follow the links and you will see an option to "update firmware" choose this option and it will update. Hope this helps
This issue may be resolved by performing a firmware update. To do this you need to gather your TVs important info, including serial number and model. Then go to your TV manufacturer's website and pull up your model's support page. On that page there should be a firmware update link. This link will download a firmware update to your computer so you can upload it to a USB drive to use on your TV. Each TV has a set of instructions for updating the firmware. I would advise you find and familiarize yourself with these instructions before trying to update your TV.
That totally stinks! Do a search for that tv on the internet. You might be able to get a main board inexpensively. I did for an LG 32 inch. I got all the circuit boards for the tv (never used) for less than $100. I replaced the main board and works great. Replace only if you know what you are doing!