My fw_update attempt ... :
# fw_update -v -p ./
Path to firmware: file:./
Installing: wpi-firmware uvideo-firmware intel-firmware
file:./wpi-firmware-3.2p1.tgz: unsigned package (signify(1) doesn't see old-style signatures)
file:./uvideo-firmware-1.2p2.tgz: unsigned package (signify(1) doesn't see old-style signatures)
file:./intel-firmware-20180807v0.tgz: unsigned package (signify(1) doesn't see old-style signatures)