Two options for performing checksum calculations on downloaded files are shown below. Only one needs to be used. Choose the option that is most convenient for you. Compare your results to the values provided in the table below. The results are not case sensitive (upper case letters are considered the same as its corresponding lower case letter).
7-Zip is a free and open source program for managing compressed files such as .zip, .tar.gz, and .rar files. File checksums can be performed with the Windows Explorer Right Click Menu provided by the latest 7-Zip Version, if you have it enabled in the 7-Zip options, as shown below:
Once completed, right click on the extracted firmware file in Windows explorer and choose CRC SHA -> SHA256
Validate that the checksum matches the listed hash above for the corresponding firmware version.
Alternatively, Notepad++, a free and open-source alternative, can be used to generate SHA-256 hashes for files. To calculate the hash on a file, click the Tools-> SHA-256 -Generate from files... menu option
Next, click on the Choose Files to generate SHA-256... button and navigate to the firmware file to be verified
The hash can be found in the box below. Compare this value to the value found in the post above.
Thanks to Chris Kerr for providing the steps above. I will continue to update this post with more firmware versions.