I started again through your instructions purged and reinstalled broadcom. also ran the command to remove blacklisted bcm43. no error report.ran modprobe b43 and tested the wifi before rebooting no wifi, did not make the changes permanent.
I have also tried running both options for drivers in the driver manage non worked so I reverted to recommended driver.
Im not sure how to see if drivers are blacklisted.
Could the problem be the acer wmi file which has caused problems n the past?
All the best