How to fix the 'Unsupported Protocol' error on the printer

In the process of using the printer on a computer, even if you are the right printer user, you still run the risk of an 'Unsupported Protocol' error message.

To fix this problem, please refer to and try one of the methods to fix 'Unsupported Protocol' error on the printer that I will guide the following.

1. Turn on the Send True Type feature in Bitmap mode

The steps are as follows:

Step 1: To change the printer settings, go to Control Panel> Hardware and Sound and open Devices and Printers.

Step 2: Right-click the printer icon, then select Printing Preferences and open the Advanced tab .

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Step 3: In the Printer Features section, set Send True Type as Bitmap to Enabled - that is enabled.

Step 4: You confirm the operation just by clicking OK to save. Then conduct retry printing to check.

2. Change the value of Print Optimizations

If the above steps still do not fix the Unsupported Protocol error, you should change the Print Optimizations value value again, by following the steps below:

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Step 1: In the Control Panel , right-click your printer device to display different options.

Step 2: In the Printing Preferences dialog box that appears, select the Advanced tab .

Step 3: In the Document Options section , try changing the Print Optimizations value . Then save the operation just entered and then conduct retry printing to check.

3. Update the USB driver of the printer

This is also a fairly simple method. Follow the steps below to try updating the USB driver of the printer.

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Step 1: You press the Windows shortcut key + R key to open the Run dialog box . Then type the phrase devmgmt.msc into the Run dialog and press Enter.

Step 2: If asked for an admin password or confirmation message, enter the password or click the Allow box .

Step 3: Expand Universal Serial Bus Controllers in Device Manager and navigate to USB port driver.

Step 4: Right-click the USB controller driver and click Update driver software to update the driver software.

Step 5: In the next window, select Search automatically for updated drivers (connect to the network to find the latest driver version). After the process is completed, click OK .

4. Disconnect from the printer and try to connect again

The steps are as follows:

Step 1: You identify the printer you are using by visiting the Devices and Printers section in the Control Panel . Then right-click on the name of that printer.

Step 2: Choose Remove device option in the options menu that appears, then click Yes from the Remove Device dialog box item .

Step 3: To add the printer back to the computer, go to Settings> Devices> Printers & Scanners.

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Step 4: Click the Add a Printer or Scanner button to search for printers that are operating near the computer, whether they are connected to a computer or connected to the network.

Step 5: Once you see the printer name appear on the screen, tap it immediately.

If you don't see the printer's name, click the The printer that I want isn't listed link. This will open the Add Printer dialog box, which will provide you with the tool to scan for older printer types, connect to printers over the network, or add printers with custom settings. Then, click the Next button to continue.

Step 6: You follow the instructions shown on the screen to complete the installation process. Your printer will eventually be displayed again in the Printers section.

If you did not succeed in the above steps, try removing the printer from the installed system. Then add it back to the computer again and check again if the problem persists.

Alternatively, try plugging the printer directly into the computer with USB, then right-click its icon and select Printer Properties . Then open the Ports tab and select the USB port before retry printing to check.

So I have shown you how to fix the 'Unsupported Protocol' error on the easiest printer. Hopefully this article will be helpful to you. I wish you successful implementation!