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Dell Latitude E5400 Notebook computer is powered by an Intel Core 2 Duo T7250 / 2.0 GHz and features a 14.1in screen with a max resolution of 1280 x 800 ( WXGA )

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How to remove bios password?

I would like to reinstall windows vista OS on my dell latitude e5400 but I do not know the bios password to change the boot drive sequence.

The Systemem Number: 8M6F5N1-2A7B

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Just curious. Why not just press F12 to get boot menu? Does the BIOS password block this?


The BIOS password is supposed to block all access to the computer including the BIOS. If you've forgotten it you might be able to remove the forgotten password by unplugging the CMOS battery, wait about ten minutes then plug it back in. Be careful when you unplug it. The wires are very thin and it's easy to accidentally pull them out of the plug itself.


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I have had to deal with this issue in the past. These are the solutions that worked for me:

1) Unplug or remove the CMOS battery AND main battery OR check for BIOS jumpers on the motherboard. This will reset the BIOS password (this may not be an option on your model).

2) Contact Dell Support. Give them your Service Tag number. They will need to verify ownership, but will be able to unlock your device.

3) There are several online services that will provide you with a master password for a fee based on your Service Tag number. Do an online search.

4) Take the device into an authorized Dell repair facility. They can unlock the device for you as well.

5) There are lists of master passwords based on your Service Tag and laptop model ( I have had limited success with this option).

6) IF ALL ELSE FAILS - Replace the motherboard. The BIOS is encoded on a chip on the motherboard, which you can replace. For your particular model, it is only about $80.


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(1) First Note Down Unique Dell Code Which Is Start With #12AB34-B56C78

(2) Download Bios Master Password Generator From Google Play

(3) Open App Type In The Box Your Laptop System Unique Code Without # And Hit Genrate Then You Will See Master Password Put The Master Password Into Your Laptop And Hit Enter Key Then Remove Password From BIOS Setting 100% Working

Note- When You Will Going To Put Password There Is Not Show Typing Word Thanks!


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I personally owned a E5420 with this problem.

I can tell you none of the suggestions here work.

Sure you have your Serial Number, Model Number, Express code, etc.

Calling Dell with these numbers will not help unless the laptop is still under a service contract or extended warranty.

Calling Dell without these will get you literally laughed at (you can hear them in the background) and they will ask you for about $120USD to provide the proper code.

The Latitude E5400 is an Enterprise class laptop, hence incredible layers of security.

Pulling the CMOS batter will not help.

Removing the battery and holding the power button will not reset it.

Replacing the CMOS chip itself is overkill.

What you need to do is note the CMOS code it provides you and find the proper unlock on Ebay and pay them for the master unlock code, which I ended up relenting to do.

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listen to this guy, he is the only one on this thread that knows the process for this laptop. I have found that these are very popular on ebay being sold as password locked, usually from corporations. There is one link that may work using a password found from a hash of your service tag but chances are slim. Ebay link is viable solution.


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The recommended way is to go to manufacturer with service tag# and model# and they will reset your passowrd.

you can also try dell passwords dot com. you can also look for a jumper reset on your laptop motherboard. for that you can follow tutorials available on you tube to unlock password for bios.

Try Hiren Boot CD or Hiren Boot USB boot computer with Hiren CD/USB and follow on screen instruction to change bios password.

Good Luck.

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Jumper resets on the motherboard have worked in the past, but I don't believe those are an option anymore on the newer laptops.


Hiren loads AFTER the BIOS.


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Remove the battery and press the power button for more than 10 seconds, it will reset the bios settings to factory default.

All the best.

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does not work


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Didn't work I have a Dell latitude 5400 asking for security manager password and I don't have that

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Saya memiliki dell e5400 yang tidak bisa di buka kode bios nya dengan seri 5J2L62S-2A7B terima kasih mohon solusi nya


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