How to Fix Logitech K400 Plus Not Pairing to Bluetooth 4i1t2p

Is your Logitech K400 Plus not connecting or getting detected on your PC? The Logitech K400 Plus is a popular wireless keyboard that comes with a built-in trackpad, making it a convenient choice for media PCs, casual browsing, or living room setups. While it’s not designed for gaming since it lacks mechanical switches and backlighting—it works great for everyday use.

One common source of confusion: the K400 Plus does not use Bluetooth. It connects wirelessly via a 2.4GHz USB dongle known as the Logitech Unifying Receiver. So, if you’re trying to pair it through Bluetooth settings, it simply won’t show up.

However, even with the dongle plugged in, some s have reported that the keyboard is not being recognized, not responding, or disconnecting randomly. In this guide, we’ll go through several effective troubleshooting steps to help you fix the issue and get your Logitech K400 Plus working again in 2025.

Fix Logitech K400 Plus Not Pairing to Bluetooth 5b3b5r

This article will list various troubleshooting steps to help fix Logitech K400 Plus not Pairing to Bluetooth. 

Switch USB Port 17115q

The very first thing that you should try doing is switching the USB port. If the port you use is problematic, it may not identify the wireless dongle, and you will face issues while pairing Logitech K400 Plus. In that case, we recommend you switch your USB port. Plugin the wireless adapter into a different USB port and then check if you still face this issue or not. 

Ensure No Other Device Is Connected To Bluetooth 135q6z

Though Logitech K400 Plus uses a wireless adapter to connect to your PC, the issue may often be faced when another device is connected to your Bluetooth. Ensure no other devices are connected to your PC via Bluetooth, and then try connecting your keyboard. 

Restart PC 3os27

Another troubleshooting step to follow is restarting your PC. If there are bugs within your system or temporary glitches, they might cause Logitech K400 Plus Not Pairing to Bluetooth issues. We would recommend you restart your PC to fix the bugs you face with it.

Update Windows Version 411711

If it is a bug with Windows, new updates will bring the patch for it. You can try updating your Windows to the latest version. To do so, follow the steps given below-

• Press Windows + I key to open the Settings app on your PC. 
• Head to the Windows Update section from the left sidebar. 
• Now on the right side, click on Check for updates.

• and install the available updates.
• Restart your PC, and then check if you are still facing the issue or not. 

Install Unifying Software 28847

You should install the Logitech Unifying software if you use a Logitech device. This software is designed for Logitech devices, and if you face any problem with the Logitech K400 Plus, this software should probably fix it. To install this software on your PC, follow the steps given below-

• Click on this link to head to the Logitech Unifying Software Page. 
• From here, the software on your PC. 

• Now open File Explorer by pressing the Windows + E key combo. 
• Here, head to the location where you have saved the file. Double-click on the ed file to run the installer. 
• Wait for the software to install. Once done, check if you still encounter the same issue or not. 

If you already had the Unifying software on your PC, you should try updating it. 

Turn Off Power Saving For USB 4e5pp

The next thing you can try doing is turning off Power Saving for USB. Many s have reported that this issue was caused due to the power-saving settings of your USB port. This generally happens when power saving is turned on for USB, and your windows keep turning off the USB port to save power. You should try turning off power saving for USB to fix Logitech K400 Plus not pairing to Bluetooth issue. To do so, follow the steps given below-

• Press Windows + X key combo and then click on Device Manager to open it. 
• Here, expand the Universal Serial Bus Controllers section by double-clicking on it. 
• Now, right-click on your USB driver and then on Properties. 

• In the Properties, head to the Power Management tab.
• Uncheck all the checkboxes here, and click on OK.

• Do this for all the USB port drivers and close the Device Manager. 

Disable USB Selective Suspend Setting (Windows 11/10) 1i333l

Sometimes, Windows may turn off your USB ports to save power — especially on laptops or newer desktops. This can cause the Logitech Unifying Receiver to stop working intermittently or not get detected at all.

• Press the Windows + S key and search for Control , then open it.
• Click on Hardware and Sound, then go to Power Options.
• Click on Change plan settings next to your selected power plan.
• Then click on Change advanced power settings.
• In the Power Options dialog, scroll down and expand USB settings.
• Under USB selective suspend setting, set it to Disabled.
• Click Apply and then OK to save the settings.

After doing this, restart your PC and plug the dongle into a USB port again. This should help prevent Windows from turning off the USB receiver.

Try Logitech Logi Options+ Software 2575g

Logitech has started phasing out older software like Logitech Options and Unifying Software in favor of Logi Options+, their new unified platform for configuring Logitech devices. While Logitech K400 Plus is not officially ed in Options+, having this software installed may still help in case of driver conflicts or if you’re using multiple Logitech devices.

• Visit the official Logi Options+ page here: https://www.logitech.com/software/logi-options-plus.html
• and install the software on your Windows 10 or Windows 11 PC.
• Restart your system and check if the dongle is working better.

This method won’t directly configure the K400 Plus, but it can help resolve broader compatibility issues across Logitech devices.

Enable Legacy USB in BIOS (Advanced Step) 601sy

If your keyboard and dongle are not being detected at all — even in BIOS or during boot — the problem could be your motherboard’s USB settings. Many new PCs come with USB legacy turned off by default, which may cause wireless dongles to malfunction.

To enable legacy USB :

1. Restart your PC and enter the BIOS/UEFI settings by pressing the Delete or F2 key repeatedly during boot.
2. Once inside BIOS, look for options like:
   Legacy USB
   USB Compatibility
   USB Initialization
3. Make sure these options are set to Enabled.
4. Save changes and exit BIOS (usually by pressing F10).

This will ensure your USB dongle gets recognized at boot level, especially helpful for older peripherals like the K400 Plus.

Scan and Reinstall Keyboard Drivers Manually 5b5a4p

Sometimes Windows may load a generic driver or fail to install the correct one. You can reinstall the keyboard driver manually through Device Manager.

• Press Windows + X and select Device Manager.
• Expand the Keyboards section.
• Right-click on HID Keyboard Device or any Logitech device listed and click on Uninstall device.
• Once uninstalled, unplug the Logitech dongle.
• Restart your PC.
• After rebooting, plug the dongle back in and wait for Windows to automatically reinstall the drivers.

This often resolves detection and input issues with older or semi-ed wireless keyboards.

Use a Powered USB Hub (if using laptop or ultrabook) d5o4c

Some thin laptops or ultrabooks may not provide enough power to USB ports, especially when several peripherals are connected. If your Logitech K400 Plus keeps disconnecting or is not recognized, try using a powered USB hub.

These hubs have external power and ensure your dongle gets a consistent power supply without being affected by power-saving settings or voltage drops.

Just plug the Logitech dongle into the powered USB hub and connect the hub to your laptop or PC.

Final Words 2f1ea

Logitech products are well known for their quality and reliability. Issues like Logitech K400 Plus not pairing to Bluetooth are less likely to happen. However, this article will help you fix this issue if you are still facing it. We have mentioned some troubleshooting steps to fix Logitech K400 Plus not pairing to Bluetooth. You can follow the steps above and not face this issue again. 

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