Date: 2020aug27 OS: Linux Distro: Fedora Keywords: update Q. Fedora: how to upgrade to Fedora 33 beta A.

sudo dnf --refresh upgrade sudo dnf install dnf-plugin-system-upgrade sudo dnf system-upgrade download --releasever=33 --setopt=module_platform_id=platform:f33

This worked for me. Based on https://www.reddit.com/r/Fedora/comments/b8jqyq/announcing_the_release_of_fedora_30_beta/