By "unofficial fedora-upgrade tool" I suppose you mean "yum
upgrade"? I've seen posts about it, but never tried it myself.
No
$ sudo dnf info yum-upgrade
Available Packages Name : fedora-upgrade Arch : noarch Epoch : 0 Version : 21.2 Release : 1.fc21 Size : 34 k Repo : updates-testing Summary : Upgrade Fedora to next version using yum upgrade (unofficial tool) URL : https://github.com/xsuchy/fedora-upgrade License : GPLv2 Description : Upgrade Fedora to next version using yum upgrade. : This is attempt to automatize steps as listed here: : https://fedoraproject.org/wiki/Upgrading_Fedora_using_yum : : This is an unofficial tool, for official Fedora-supported : upgrades please see the 'fedup' tool.