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Dell Optiplex 755 Slic 2.1

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Dell Optiplex 755 Slic 2.1

How to Upgrade Dell Optiplex 755 BIOS to Support SLIC 2.1

If you want to install a newer operating system on your Dell Optiplex 755 desktop computer, you may need to upgrade its BIOS to support SLIC 2.1. SLIC stands for Software Licensing Description Table, and it is a digital signature embedded in the BIOS that allows the operating system to be activated automatically without entering a product key.

By default, the Dell Optiplex 755 comes with BIOS version A21, which supports SLIC 2.0. This means that it can activate Windows Vista and Windows 7 without any problem. However, if you want to install Windows 8 or Windows 10, you will need SLIC 2.1, which is not supported by the original BIOS.

Fortunately, there is a way to modify the BIOS to add SLIC 2.1 support. This involves downloading a modified BIOS file from a trusted source and flashing it to your motherboard using a USB flash drive. However, this process is not without risks, and you should only attempt it if you are confident in your technical skills and willing to accept the possibility of bricking your computer.

Here are the steps to upgrade Dell Optiplex 755 BIOS to support SLIC 2.1:

Download the modified BIOS file from this link. The file name is

Extract the zip file and copy the O755-A21_SLIC21.exe file to a USB flash drive formatted as FAT32.

Plug the USB flash drive into your Dell Optiplex 755 and restart the computer.

Press F12 repeatedly during boot to enter the boot menu and select USB Storage Device as the boot option.

Follow the on-screen instructions to flash the modified BIOS file to your motherboard. Do not turn off or interrupt the power during this process.

After the flash is complete, restart the computer and enter the BIOS setup by pressing F2 during boot.

Verify that the BIOS version is now A21 with SLIC 2.1 support. You can also use a tool like RWEverything to check the SLIC table in your BIOS.

Save and exit the BIOS setup and proceed to install your desired operating system.

Congratulations! You have successfully upgraded Dell Optiplex 755 BIOS to support SLIC 2.1. You can now enjoy the benefits of automatic activation for Windows 8 and Windows 10 on your desktop computer.

Why Upgrade Dell Optiplex 755 BIOS to Support SLIC 2.1

There are several reasons why you may want to upgrade Dell Optiplex 755 BIOS to support SLIC 2.1. One of them is to take advantage of the latest features and security updates offered by Windows 8 and Windows 10. These operating systems have improved performance, stability, and compatibility compared to Windows Vista and Windows 7.

Another reason is to save money and hassle on activating your operating system. With SLIC 2.1, you do not need to purchase a separate product key or enter it manually during installation. Instead, the operating system will automatically detect the SLIC signature in your BIOS and activate itself without any intervention from you.

This way, you can avoid the risk of losing or forgetting your product key, or having it stolen or blocked by Microsoft. You can also avoid the annoyance of dealing with activation errors or warnings that may pop up from time to time.

What are the Risks of Upgrading Dell Optiplex 755 BIOS to Support SLIC 2.1

While upgrading Dell Optiplex 755 BIOS to support SLIC 2.1 has many benefits, it also comes with some risks that you should be aware of before proceeding. One of them is the possibility of bricking your computer if something goes wrong during the flashing process.

Flashing a modified BIOS file is not an official procedure supported by Dell, and it may void your warranty or cause compatibility issues with some hardware or software components. If the flash fails or gets interrupted by a power outage or a user error, you may end up with a corrupted BIOS that prevents your computer from booting up at all.

In that case, you may need to replace your motherboard or use a special tool or service to recover your BIOS. Th


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