Hey there everyone, I'm trying to flash my 2009 4,1 to 5,1 but I keep running into this issue with the firmware tool. It says 'This program requires Internet Access. Please connect your Mac Pro to the Internet and Try Again'. I am connected to the internet. I read that the typical fix was to download the 1.5 2010 Firmware from here: https://support.apple.com/kb/DL1321 and then mount it, but don't click the .pkg. I did that exact process and I get the same error. Any ideas on how to help? Thanks!