In the same directory, download the pfSense-CE-2.5.1-RELEASE-amd64.iso.gz.sha256 file.
Netgate (the company behind pfSense) does not prominently display old ISO downloads on their main landing page. They want you on the latest version for security patches. Pfsense 2.5.1 Download Iso
Stay safe, and happy firewalling. Did we miss a specific step for writing the memstick image to a USB drive? Let us know in the comments below. In the same directory, download the pfSense-CE-2
Here is everything you need to know about finding, verifying, and installing pfSense 2.5.1 safely. Released in early 2021, pfSense 2.5.1 was a reactive release. The original 2.5.0 release had significant growing pains, particularly with the move to FreeBSD 12.2-RELEASE and the introduction of Unbound as the primary DNS forwarder. In the same directory