bcm20702a1-firmware from openSUSE:Leap:15.4 project
Select Your Operating System
Add repository and install manually
For standard run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.4/standard/openSUSE:Leap:15.4.repo zypper refresh zypper install bcm20702a1-firmware