Wifi not working on Mac Os Big sur update

App & System Services Core OS
Pradeep_Yamarthi OP
Created Aug ’20
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After the beta update i did on MAC os Big sur my system does not connect to any Internet huge huge problem as cannot do anything with the Mac book air now
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DiptimanBadajena OP
Nov ’20
I recently updated to macOS Big Sur 11.0.1 and I faced the same challenge. The network data transfer rate dropped over Wifi. These are the following steps advised by Apple Support:

A. Reconfigure the DNS
steps:

  1. System Preferences

  2. Network

  3. WiFi

  4. Advanced

  5. DNS tab

  6. Add 8.8.8.8 or 8.8.4.4

  7. Click OK then Apply

B. Adjust Packet Size
steps:

  1. System Preferences

  2. WiFi

  3. Advanced

  4. Hardware tab

  5. Configure location from automatic to manually

  6. MTU 1453

  7. Save/Apply

C. Change location and renew DHCP lease
steps:

  1. System Preferences

  2. Network

  3. WiFi

  4. Edit location Add location

  5. Advanced

  6. TCP/IP

  7. Renew DHCP lease

  8. Click OK then Apply

D. reset NVRAM and SMC. attached are the articles for the steps do the these resets.

Reset NVRAM or PRAM on your Mac
How to reset the SMC of your Mac
(To know your machine has T2 Security Chip: OPTION-KEY+CLICK ON APPLE LOGO >> System information >> Controller)
0
EddeeB OP
Apr ’21
Found this post after months of struggling and following other suggestions online. Putting in a DNS address made my WiFi stable enough to download the Big Sur 11.3 update. Installed it and rebooted, removed the manual DNS entry and I've been online for 2+ hours now. Huge improvement! I think the bug got squashed for me.
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Wifi not working on Mac Os Big sur update
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