These steps had worked for me earlier when I had installed GeckoLinux(a customized Leap 42.1) with LXQT on the same laptop. But this time around, after the reboot, there is no difference and the WiFi networks are still undetected. Here is a screenshot of the display when I did the steps:
16.018316] b43-phy0: Broadcom 4312 WLAN found (core revision 15)
16.048316] b43-phy0: Found PHY: Analog 6, Type 5 (LP), Revision 1
16.048336] b43-phy0: Found Radio: Manuf 0x17F, ID 0x2062, Revision 2, Version 0
16.064440] Broadcom 43xx driver loaded Features: PNLS ]
16.139314] b43 ssb0:0: Direct firmware load for b43/ucode15.fw failed with error -2
16.139342] b43 ssb0:0: Direct firmware load for b43/ucode15.fw failed with error -2
16.139372] b43 ssb0:0: Direct firmware load for b43-open/ucode15.fw failed with error -2
16.139385] b43 ssb0:0: Direct firmware load for b43-open/ucode15.fw failed with error -2
16.139389] b43-phy0 ERROR: Firmware file "b43/ucode15.fw" not found
16.139391] b43-phy0 ERROR: Firmware file "b43-open/ucode15.fw" not found
16.139394] b43-phy0 ERROR: Please open a terminal and enter the command "sudo /usr/sbin/install_bcm43xx_firmware" to download the correct firmware for this driver version. For an off-line installation, go to http://en.opensuse.org/HCL/Network_Adapters_(Wireless)/Broadcom_BCM43xx and follow the instructions in the "Installing firmware from RPM packages" section.
The web page has been deleted and due to no network on the system itself, I don’t believe the sudo command would be helpful. So don’t really know what to do next