The current blscfg module is only compatible with GRUB core images installed by Fedora 21 or newer releases. Legacy BIOS users upgrading a system originally installed with Fedora 20 or earlier won't have the GRUB menu populated due this incompatibility.
This update makes the blscfg module to work with prior Fedora releases up to Fedora 19.
sudo dnf upgrade --refresh --advisory=FEDORA-2019-37fbde5e5b
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