Checksum of dynamic updates

Did you know that the Palo Alto Networks firewall verifies the checksum of the dynamic update file while we upload the file to the firewall manually?

How can you test this?

You  can test as follows: 

Change the dynamic update file and try to upload it to the firewall. You will get the following error:  

Note that the file can be changed in notepad ++.  Open that file in notepad++  then select the open view in HEX. Change any value and save the file.

If you undo the changes  you made in the file and then try to upload, you will be able to upload that file to firewall.