The easiest way would be to download kernel-default.rpm and install it via zypper install. Grab the file: http://download.opensuse.org/repositories/home:/tiwai:/bsc1203922/standard/x86_64/kernel-default-6.0~rc7-2.1.g8a1cf40.x86_64.rpm and install it "zypper install kernel-default-6*.rpm". You might need to pass --oldpackage option if you've installed other kernel. Also, don't forget to turn off Secure Boot if you enabled it beforehand. Once after testing, you can simply uninstall this kernel again via "zypper rm kernel-default-6.0~rc7-2.1.g8a1cf40" to go back to the clean state.