6 fixes

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When you plug in your USB flash drive, a balloon warning in system tray would pop up to lớn tell you that USB Device Not Recognized. Sometimes you don’t even see this notification & 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 lớn try them all, just work your way down và 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Faulty or outdated USB driver can render your USB devices not responding. Lớn fix it:1) On your keyboard, press the Windows biệu tượng công ty key & R at the same time lớn invoke a Run command. Type devmgmt.msc in và 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, check 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 & clickOK.
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5) Reboot your computer with the USB flash drive connected. See if Microsoft helps you detect & install the new USB driver.If you have 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 latest version of the USB driver for you, you might need to tìm kiếm for it by yourself.If you don’t have the time, patience or computer skills lớn update your drivers manually, you can vị it automatically with Driver Easy.Driver Easy will automatically recognize your system and 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, và you don’t need to worry about making a mistake when installing.You can update your drivers automatically with either the miễn phí or the Pro version of Driver Easy. But with the Pro version it takes just 2 clicks (and you get full support and a 30-day money back guarantee):1) Download và install Driver Easy.2) Run Driver Easy and click the Scan Now button. Driver Easy will then scan your computer and detect any problem drivers.

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3) Click the Update button next to the flagged USB device lớn automatically tải về and install the correct version of this driver (you can vì chưng this with the free version).Or click Update All lớn automatically tải về and 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 lớn upgrade when you click Update All).
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Method 3:Remove External Devices

If there are too many USB devices connected lớn your PC, some of them might not respond or work properly. Lớn fix it, you can try clean restart your PC:Remove or disconnect all unnecessary discs & devices from your computer. Make sure that the computer is off, and then remove any discs và 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., & leave mouse, keyboard & monitor connected.If you are a laptop user:1)Turn off the computer và make sure you have 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 the battery from the battery compartment.3)Press and hold the Power button for about 15 seconds to drain any residual electrical charge from the capacitors that protect the memory. 4)Insert the battery và AC adapter back into the laptop, but make sure you don’t connect any external devices just yet.5)Press Power button to lớn turn on the computer. Thenreconnect the USB devices one by one.If you are using desktop:1)Turn off the computer completely and disconnect the power cord from the back of the computer.2)Press the power nguồn button on the computer for 5 seconds.3)Reconnect the nguồn cord and 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,usbvideo.inf
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3) If some of the above files are missing, you need to lớn create them.If you have another computer with all the USB ports well functioned, look for the files in that computer, copy và paste them here.4) If you don’t have 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,usbvideo.inf, one by one.You can save them directly to theC:Windowsinffolder when you are downloading or you can copy them to lớn the C:Windowsinffolder all together after you have downloaded all of them.5) After the files are replaced or created, you need to unplug all of your USB devices và then plug them back in again. If necessary, you can also do a reboot.Related post:What to bởi if USB not recognized in Windows 10?