I have a MacBook Pro 6,2. Some time ago (1,5 year I guess) I have installed latest Mountain Lion upgrade and my WiFi stopped working in that I get an error connecting to several different networks.
To solve this I hoped upgrades would help, so I did upgrades to Mavericks and Yosemite but no success with Wi-Fi.
I have small TLink wifi dongle and managed to make it working via Wireless Network Utility but the dongle has weak antena so MBP went to the cupboard for some time.
Recently I decided to install fresh Mountain Lion again hoping that maybe old software will help. I noticed that if I reset the SMC nadn NVRAM, AirPort connects and works for several minutes and then stops again.
I have the idea to downgrade to the previous firmware version hoping it will sove the issue. The version I currently have is EFI: MBP61.0057.B11 (2015-002) and SMC: 1.58f17 (SMC 1.7).
I have found this: https://support.apple.com/pl-pl/HT201518 but it says only what is the latest version. I'm looking for the previous one.
Is it possible that the firware update has broken my Wifi ? Could anybody suggest a site where can I find list of SMC and EFI software versions proper for my MBP6.2?