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====== How to verify the checksum of a downloaded file in Windows ======

Here is a way of verifying the checksum, for example, of a BIOS update file that would be downloaded from Dell Support website for the purpose of updating the BIOS on the motherboard of a particular model Dell PowerEdge T110 II Server.  

Dell's recommendation with respect to the downloaded file:  

To ensure the integrity of your download, please verify the checksum value.

MD5:  7c68c361de9a3b38fa5aa2cb6e70e1d2

SHA1:  6e58d7caccb6a626d5ffc8f702bb444358ea5c5d

SHA-256:  f1ec6eea936a0fffed580e6c301149054cd4918113d0aea3b800945c607027bf 

===== Steps to verify the checksum. =====

1. In Windows, open a command prompt; that is, right click the Windows Start button and left click to select "Run" from the list and type/enter "cmd.exe" (without the quotes) and click OK, or, next to the Start button, type/search for "cmd" or "cmd.exe" or "command prompt" (without the quotes) and open the top search results for cmd.exe or command prompt.  A black command prompt window should open and display something like the following.  

<code>

Microsoft Windows [Version 10.0.19045.3803]
(c) Microsoft Corporation. All rights reserved.

C:\Users\Username>

</code>

**1. Change to the subdirectory path where the downloaded file is located**

<code>

C:\Users\Username> cd c:\users\pc\downloads\T110-II_BIOS_5R0T5_WN64_2.10.0_01\

</code>

**2. Run the CertUtil -hashfile command and insert the filename of the downloaded file and append either SHA256 or MD5 or SHA1**

<code>

c:\Users\Username\Downloads\T110-II_BIOS_5R0T5_WN64_2.10.0_01> certUtil -hashfile T110-II_BIOS_5R0T5_WN64_2.10.0_01.EXE SHA256

SHA256 hash of T110-II_BIOS_5R0T5_WN64_2.10.0_01.EXE: f1ec6eea936a0fffed580e6c301149054cd4918113d0aea3b800945c607027bf

CertUtil: -hashfile command completed successfully.

c:\Users\Username\Downloads\T110-II_BIOS_5R0T5_WN64_2.10.0_01>

</code>

**3.  Visually compare the generated hash checksum value in the above example to the expected given SHA-256 checksum value.  If they match, then you have verified the integrity of the downloaded file.**

<code>
Generated SHA256: f1ec6eea936a0fffed580e6c301149054cd4918113d0aea3b800945c607027bf

Expected SHA-256: f1ec6eea936a0fffed580e6c301149054cd4918113d0aea3b800945c607027bf
</code>

===== Here is another example, this time generating an MD5 checksum. =====

<code>
c:\Users\Username\Downloads\T110-II_BIOS_5R0T5_WN64_2.10.0_01> certUtil -hashfile T110-II_BIOS_5R0T5_WN64_2.10.0_01.EXE MD5

MD5 hash of T110-II_BIOS_5R0T5_WN64_2.10.0_01.EXE: 7c68c361de9a3b38fa5aa2cb6e70e1d2

CertUtil: -hashfile command completed successfully.

c:\Users\Username\Downloads\T110-II_BIOS_5R0T5_WN64_2.10.0_01>

</code>

**Visually compare the expected MD5 checksum value with the generated MD5 checksum value:**

<code>
Expected MD5: 7c68c361de9a3b38fa5aa2cb6e70e1d2

Generated MD5: 7c68c361de9a3b38fa5aa2cb6e70e1d2
</code>