Wifi Adapter not working with some kernels

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Hi @GoldenAJF
My 2 cents
Try install an LTS kernel and:

  1. linux-lts-headers
    Then reboot to the new kernel.
    Maybe after that if it didn’t work:
  2. broadcom-wl-dkms (that worked with me. I hope someone more experienced correct it if I am wrong, maybe different for your hardware)

Let me know if this helps.
Have a look at Internet connection is way too slow - #6 by limotux

Let me know if this helps.
Good luck.