Forget Discover or any GUI, simply none of them is properly working at best.
Big update right now does not really make much sense, Beta ISO is just around 1 week old so you should not have too much to update.
For my own updates instances, I use the commands:
$ sudo dnf clean all $ dnf clean all $ sudo dnf --refresh upgrade 2>&1 | tee konsole_01-update.log
(next will be:
$ sudo dnf --refresh upgrade 2>&1 | tee konsole_02-update.log
etc, as I want to keep trace of every update)
Also, before the very first update I run:
# rpm -e --nodeps openmandriva-repos-4.0-0.0.11.x86_64
accordingly to the output of
rpm -qa|grep repos-4.0
Hope it helps.