If you have aliendalvik-control installed, it can either leave a bootup service installed that now blanks the screen in 3.4.0, or cause the update to fail half-way through.
If your upgrade was successful, but your device now boots to a blank screen, then you could try removing aliendalvik-control either over ssh with ‘rpm -e --noscripts aliendalvik-control’ (as root) or if you can only get in via recovery mode then remove the file ‘usr/lib/systemd/user/aliendalvik-control-edge.service’ as root then do the full removal when booted.
If the update failed mid-way through and will not resume, then it might be the case that your libzypp package was updated while ssu wasn’t, which breaks repo resolution. In this case, people have had some luck running ‘cp /usr/lib/zypp/plugins/urlresolver/ssu /usr/libexec/zypp/plugins/urlresolver/’ as root, then trying to update again.
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