Procedure to update bios.
# Add Dell repo
cat << 'EOF' | sudo tee /etc/yum.repos.d/dell-system-update.repo
[dell-system-update_dependent]
name=dell-system-update_dependent
baseurl=https://linux.dell.com/repo/hardware/dsu/os_independent/
gpgcheck=1
gpgkey=https://linux.dell.com/repo/pgp_pubkeys/0x756ba70b1019ced6.asc
enabled=1
exclude=dell-system-update*.i686
[dell-system-update_independent]
name=dell-system-update_independent
baseurl=https://linux.dell.com/repo/hardware/dsu/os_dependent/RHEL9_64/
gpgcheck=1
gpgkey=https://linux.dell.com/repo/pgp_pubkeys/0x756ba70b1019ced6.asc
enabled=1
exclude=dell-system-update*.i686
EOF
# Install with nogpgcheck workaround
sudo dnf install -y --nogpgcheck dell-system-update
# Import the correct key
sudo rpm --import https://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc
# Download DSU key files
sudo mkdir -p /usr/libexec/dell_dup
for key in 0x756ba70b1019ced6.asc 0xca77951d23b66a9d.asc 0x076B95DB2FFC7F4A.asc 0x1285491434D8786F.asc 0x3CA66B4946770C59.asc 0x274E9C32857A9594.asc; do
sudo curl -o /usr/libexec/dell_dup/$key https://linux.dell.com/repo/pgp_pubkeys/$key
done
# Run update
sudo dsu --non-interactive --import-public-key