EDIT: Beta 5 is now available:
www.fractalaudio.com/downloads/firmware-presets/axe-fx-2/beta/axefx2_12p03beta5.zip
See release notes for details.
www.fractalaudio.com/downloads/firmware-presets/axe-fx-2/beta/axefx2_12p03beta5.zip
See release notes for details.