A standard upgrade does not cross known boundary conditions that require use of the fullinstall option.
device# firmware download ftp user user pass extreme host 10.x.x.x dir builds/slxos20.x.x Performing system sanity check... This command will cause a cold/disruptive reboot and will require that existing telnet, secure telnet or SSH sessions be restarted. Do you want to continue? [y/n]:y
device# show version SLX-OS Operating System Version: 20.x.x Copyright (c) 1995-2019 Extreme Networks, Inc. Firmware name: 20.x.x Build Time: 21:34:29 Nov 2, 2019 Install Time: 20:29:12 Nov 8, 2019 Kernel: 4.14.67 Control Processor: Intel(R) Atom(TM) CPU C3758 @ 2.20GHz, 8 cores Microcode Version: 0x24 Memory Size: System Total: 15632 MB System Uptime: 1days 1hrs 29mins 27secs Name Primary/Secondary Versions ------------------------------------------ SLX-OS 20.x.x 20.x.x device#