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When you plug in your USB flash drive, a balloon warning in system tray would pop up khổng lồ tell you that USB Device Not Recognized. Sometimes you don’t even see this notification và your USB flash driver just stops working.No worries, it’s possible and, in some cases, quite easy lớn fix. Here are 3 solutions for you lớn try. You may not need to try them all, just work your way down and find the one works for you. Method 1:Reinstall USB DriverMethod 2: Update USB Driver Automatically (Recommended)Method 3:Remove External DevicesMethod 4: Create INF Files

Method 1:Reinstall USB Driver

Faulty or outdated USB driver can render your USB devices not responding. To fix it:1) On your keyboard, press the Windows hình ảnh key and R at the same time khổng lồ invoke a Run command. Type devmgmt.msc in & press Enter.

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2) ExpandUniversal Serial Bus controllers. See if you can a yellow exclamation mark in front of your Host Controller.
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If you cannot see such a device underUniversal Serial Bus controllers, kiểm tra if you can see it under Otherdevices.
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3) Double-click the device with a yellow exclamation mark. Go to lớn Driver, clickUninstall.
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4) Check the box forDelete the driver software for this device and clickOK.
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5) Reboot your computer with the USB flash drive sầu connected. See if Microsoft helps you detect & install the new USB driver.If you have sầu more than one Host Controllerswith the yellow exclamation marks in front, repeat these procedures more than once.

Method 2: Update USB driver automatically

If Microsoft fails lớn find the lakiểm tra version of the USB driver for you, you might need to lớn tìm kiếm for it by yourself.If you don’t have sầu the time, patience or computer skills to update your drivers manually, you can bởi vì it automatically with Driver Easy.Driver Easy will automatically recognize your system và find the correct drivers for it. You don’t need to lớn know exactly what system your computer is running, you don’t need khổng lồ risk downloading and installing the wrong driver, and you don’t need lớn worry about making a mistake when installing.You can update your drivers automatically with either the FREE or the Pro version of Driver Easy. But with the Pro version it takes just 2 clicks (& you get full tư vấn and a 30-day money bachồng guarantee):1) Download & install Driver Easy.2) Run Driver Easy và click the Scan Now button. Driver Easy will then scan your computer và detect any problem drivers.

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3) Cliông xã the Update button next to the flagged USB device to automatically download and install the correct version of this driver (you can vì this with the FREE version).Or cliông xã Update All lớn automatically download & install the correct version of all the drivers that are missing or out of date on your system (this requires the Pro version – you’ll be prompted to lớn nâng cấp when you cliông xã Update All).
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Method 3:Remove sầu External Devices

If there are too many USB devices connected to lớn your PC, some of them might not respond or work properly. To fix it, you can try clean restart your PC:Remove or disconnect all unnecessary discs and devices from your computer. Make sure that the computer is off, và then remove sầu any discs and USB devices và the memory cards from the card reader slot. Disconnect non-essential devices such as camera, MP3-playersprinters, scanners, external hard drives etc., và leave mouse, keyboard & monitor connected.If you are a laptop user:1)Turn off the computer and make sure you have sầu disabled or disconnected all unnecessary external devices. Remove the computer from any port replicator or docking station.2) Unplug the AC adapter from the computer and remove sầu the battery from the battery compartment.3)Press and hold the Power button for about 15 seconds lớn drain any residual electrical charge from the capacitors that protect the memory. 4)Insert the battery and AC adapter baông xã into the máy tính xách tay, but make sure you don’t connect any external devices just yet.5)Press Power button khổng lồ turn on the computer. Thenreconnect the USB devices one by one.If you are using desktop:1)Turn off the computer completely và disconnect the power cord from the back of the computer.2)Press the power button on the computer for 5 seconds.3)Reconnect the power cord và turn on the power.Then reconnect the USB devices one by one.

Method 4: Create INF Files

1) Go khổng lồ C:Windowsinf folder.Make sure you can see these files listed: (there could be other files)usb.inf,usb2.inf,usbport.inf,usbprint.inf,usbstor.inf,usbClip.inf
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3) If some of the above files are missing, you need lớn create them.If you have another computer with all the USB ports well functioned, look for the files in that computer, copy & paste them here.4) If you don’t have sầu another computer, here is the alternative for you.Download the mentioned files from this webpagehttp://www.infdump.com/. You can find the files by searching with the name of the files.Download the files usb.inf,usb2.inf,usbport.inf,usbprint.inf,usbstor.inf,usbClip.inf, one by one.You can save them directly lớn theC:Windowsinffolder when you are downloading or you can copy them khổng lồ the C:Windowsinfthư mục all together after you have downloaded all of them.5) After the files are replaced or created, you need khổng lồ unplug all of your USB devices và then plug them baông chồng in again. If necessary, you can also vày a reboot.Related post:What khổng lồ vày if USB not recognized in Windows 10?