For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann/openSUSE_Leap_15.6/home:bmwiedemann.repo
zypper refresh
zypper install pullin-bcm43xx-firmware
For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann/openSUSE_Leap_15.5/home:bmwiedemann.repo
zypper refresh
zypper install pullin-bcm43xx-firmware
For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann/openSUSE_Leap_15.4/home:bmwiedemann.repo
zypper refresh
zypper install pullin-bcm43xx-firmware
For SLE 12 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:bmwiedemann/SLE_12/home:bmwiedemann.repo
zypper refresh
zypper install pullin-bcm43xx-firmware