Chosen Solution

The Airport card in my Macbook has become intermittent so I ordered and fitted a replacement, BCM94331PCIEBT4CAX. When the MacBook powers up the WiFi status indicates WiFi is OFF, attempting to turn it on silently fails. System Report -> Network -> WiFi lists the Airport card, with status OFF. The only difference between the listings for original and replacement Airport cards are : Locale FCC (orig) / RoW (replacement) Country Code XO (orig) / GB (replacement) My MacBook was purchased in the US, the replacement AirPort card was bought in the UK, where I’m located. The wifi log file shows the following :- Sun Jan 29 00:08:18.203 AirPort_Brcm43xx::platformWoWEnable: WWEN[disable] Sun Jan 29 00:08:46.363 wl0: powerChange: *** BONJOUR/MDNS OFFLOADS ARE NOT RUNNING. Sun Jan 29 17:12:19.996 Starting Up Sun Jan 29 17:12:21.084 Unable to create IO80211InterfaceMonitor Sun Jan 29 17:12:21.084 Unable to create IO80211InterfaceMonitor Sun Jan 29 17:12:21.084 <airportd[69]> airportdProcessDLILEvent: en1 attached (up) Sun Jan 29 17:12:21.092 Setting BTCoex Profile: band:8 Sun Jan 29 17:12:21.092 Profile[0]: mode:7; desense:0; desense_level:0; chain_power_offset: 0, 0, 0, 0, Sun Jan 29 17:12:21.092 Profile[1]: mode:7; desense:0; desense_level:0; chain_power_offset: 0, 0, 0, 0, Sun Jan 29 17:12:21.092 Profile[2]: mode:7; desense:0; desense_level:0; chain_power_offset: 0, 0, 0, 0, Sun Jan 29 17:12:21.092 Setting BTCoex Profile: band:2 Sun Jan 29 17:12:21.093 Profile[0]: mode:0; desense:0; desense_level:0; chain_power_offset: 0, 0, 0, 0, Sun Jan 29 17:12:21.093 Setting BTCoex Config: enable_2G:1, profile_2g:0, enable_5G:1, profile_5G:0 Sun Jan 29 17:12:21.205 <airportd[69]> _bsd_80211_event_callback: Failed to get power setting from device : err -3900 I checked and recheck installation and eventually refitted original AirPort card, which worked, but only for a while as it’s become intermittent. I’d appreciate and insight into how I can fix this issue. Thanks.

I’d give a try in reinstalling the Os if I was you. I imagine you have already tried a Pram reset. Be aware that the wifi module reinitializes when you turn off the mac, as a reboot by itself is insufficient.