Why is Brocade FOS v9.01b not available for download? Last updated Save as PDF Share Share Tweet Share Views:50Visibility:PublicVotes:0Category:fc-seriesSpecialty:SANLast Updated: Applies to Brocade switch Fabric Operating System (FOS) Answer Fos v9.0.1b is retired and no longer available for download. As of 14/03.2024, the latest FOS available for download is v9.0.1d. Additional Information Brocade FOS matrices