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Unknown publisher Is it safe to download a BIO update if the publisher is "unknown?" Is that normal? Shouldn't the publisher be DELL?

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Quite correct. Unless it comes direct from the manufacturer, don't trust it!

Posted on Feb 15, 2014


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I have Dell latitude E5420. There is an unknown device in my Device Manager, please guide how may I find what device it is and then its drivers.


make sure your operating system is updated thoroughly (go to START, WINDOWS UPDATE)
once you have done this go to this link below, download the AUDIO drivers & BIOS driver
once this has been done, go back to the link and download all applicable drivers dated for 2010 or 2011. Once you go through all these drivers, it should resolve UNKNOWN device issue.

download and save all drivers, then execute them one at a time.

hope this helps you ! if so , please send me 4 thumbs up

Aug 01, 2011 | Dell Latitude E5420 Laptop Computer

2 Answers

Hello, whenever i type, my trackpad locks for a few seconds how do i fix this?

Make sure the scroll lock button is OFF.

Download the following from the Dell Support Drivers and Downloads page.


Alps Input Drivers


After downloading these update install if starting with Quickset, Alps Driver then BIOS. After flashing the BIOS laptop will automatically restarts.

After it reboots. In Dell screen hold down the F8 then select safe mode then press enter key on it. Wait until it loads in safe mode. Try working in safe mode if problem persist if not then boot back to windows normal mode by just restarting the computer.

If problem persist in normal mode in windows then i suggest back up your files then perform windows re-installation.

In doing the reinstallation you need to use the windows installation cd came with the computer.
Boot to F12 then insert the CD windows then select to boot to CD the follow prompts.

May 28, 2011 | Computers & Internet

1 Answer

Error code 3600:0749 dell inspiron 1501 . Result is the same if it runs on battery or AC alone (no battery in laptop).

Check the system battery information and charger information of the computer restart the computer, while the computer is booting up, press F2 repeatedly check "battery info"
If it stated ac adapter = unknown device update the BIOS
Click on drivers and downloads
Click or choose by service tag
Download the BIOS and install it on the computer
Check information after updating if same message AC adapter = unknown device; call manufaturer for a replacement AC adapter, if status has changed it is a battery problem or motherboard, contact manufacturer to test battery.
Here is your products support site: Try to update all the drivers there is outdated. Hope this will help you.

Mar 13, 2011 | Dell Inspiron 1501 Notebook

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Dell E1705 will not charge aftermarket battery. Is there any work around. AC adapter is ok.

Hi there!

Try to check a few things first.

Go to the BIOS set up, which you can access by pressing f2 when you start up the computer,
Then go to the option that says battery info,
Check if the ac adapter is detected,
And check if the battery is detected,

If any of this things is not detected
Then try this things,
If in the ac adapter it says unknown,
boot to your windows normally
then make sure you still have at least
12% on the battery charge.
Then download the latest flash BIOS
update your BIOS then after you update it,
it should fix your not charging issue and fix the unknown ac adapter if ever that's the case,
But after you do that and the same thing happens,
You'll need to replace the motherboard of that computer.

Hope this helps!

Apr 13, 2010 | Dell Inspiron E1705 Notebook

1 Answer


Restart your computer and before it says "Starting Windows" (XP, Vista or whichever version you have), press the F8 function key on your keyboard. You'd get a menu. Select the "Safe Mode with Networking" and press Enter.

Once Windows boots into safe mode, try to run the programs now. If they run fine in safe mode, download Malwarebytes .

Then, update and run this anti-malware program. It will remove any virus / malware. Once this is done, reboot your computer back normally and the programs should work fine.

Hope that helps,

Mar 25, 2010 | IMSI TurboCAD Deluxe 10 for PC

1 Answer

My Dell 1535 Studio Touch pad has stopped working and my key board also has been having problems. The key board does not continue to scroll over when I hold down the arrow keys and some of the keys do not...

try to boot in safe mode first. turn on computer then keep tapping on F8 then boot to safe mode. once you booted in safe mode try to open notepad and word check if all keys working. if yes then try system restore it might be some conflict when in normal mode. if keys same problem in safe mode then try last known good configuration if still having the same problem with normal mode then try booting to F8 safe mode with networking. download the latest toucpad drivers and the latest bios for your system. install all downloaded updates then boot back to normal mode after. check if still the same problem. if yes then try to do system restore to the previous state when laptop keys was working fine. if all fails try to re-install the OS. if fails then have your touchpad, keyboard and palmrest replaced. (Note: when troubleshooting make sure you are using an external mouse and keyboard thru USB)

Oct 23, 2009 | Dell Studio 1535 Notebook

1 Answer

Dell Inspiron 1525 Laptop..the screen goes almost black after 5 minutes.

The screen goes black while in normal mode right? So try to boot in safe mode (power on then keep tapping F8 then select safe mode). Check if still happens in safe mode.

If screen does not goes black in safe mode it means there might be a software or driver causes problem when running in normal mode. You can try the following (update your anti virus software then run a full system scan, uninstall the video driver then download and install the latest one, uninstall any previous windows update or you can system restore to the time when it was working fine).

If the screen goes black even in safe mode they try connecting the laptop to an external monitor if still goes black, if yes then absolutely no issues with the LCD panel. You can try (uninstall and reinstall the video driver if still persist then this might end up replacing video card or motherboard, but before doing that update the BIOS first).

If does not goes black in ext monitor then the LCD panel might causes the problem. Reseat the LCD cable or inverter if you can.

Oct 22, 2009 | Dell Inspiron 1525 Laptop

1 Answer

Hi guy plz help me i got a dell latitude C640 and its not willing to detect my cd drive. after loading bios its telling me the device in the modular bay cannot be recognised and its not booting into...

check if any updates are availble for the bios
go to > drivers and downloads > put in your service tag and check if any update is available you can update your bios

you can also try restore your bios to factory settings you have an option for this in the bios menu as well and then connect the drive and then boot.

Further Queries are welcome
if you think my solution was helpfull please do rate me

Mar 28, 2009 | Dell Latitude C640 Notebook

1 Answer

Acer TravelMate 5520 is bio-probtected and unknown password

Try This:

Feb 14, 2009 | Acer Aspire 3680 Laptop

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