Hello,  FOS v7.1.1c is on the Target Path list so I would go with it. I have included the link to the Target Path document from Brocade below: [URL]  By the way, I understand a new TP document is going to be released which will include FOS v7.2.x releases. I do not know if FOS v7.2.1a will be TP release or not though.
Hi!  We are installing the new Brocade DCX8510-4B director. However there are different Fabric os level-s.  According the Target Revision and adoption rates document the recommended firmware level is:  7.0.2c  The director running  v7.0.1 software level. (factory shipped)  The  revision which we can download from powerlink is v7.1.1c, v7.2.1a  The question is which firmware level should i choose or should i upgrade?   BR: Pal
DCX8510-4B recommended firmware level