It is not functional.

[root@topo mayorga]# dnf system-upgrade downloadable --releasever=23 Traceback (most recent call last): File "/bin/dnf", line 36, in <module> main.user_main(sys.argv[1:], exit_code=True) File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 193, in user_main errcode = main(args) File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 84, in main return _main(base, args) File "/usr/lib/python2.7/site-packages/dnf/cli/main.py", line 120, in _main cli.configure(map(ucd, args)) File "/usr/lib/python2.7/site-packages/dnf/cli/cli.py", line 1005, in configure self.optparser.usage = self.optparser.get_usage() File "/usr/lib/python2.7/site-packages/dnf/cli/option_parser.py", line 273, in get_usage usage += "%-25s %s\n" % (name, summary) UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 40: ordinal not in range(128)