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Bluetooth not working properly after 11.5 upgrade

Hello All,


I had installed Big Sur on my Late 2016 Macbook Pro 13 and all was working well.


I then installed the 11.5 upgrade and after that none of my Bluetooth devices are working properly.

The devices connect and are recognized, but they seem to have a connection lag/interference.

Audio plays back chopped and both my magic mouse and magic trackpad lag when I move.


I tried reseting the bluetooth module, resetting PRAM, and deleting the preferences files.


Anybody else having issues?


This is very frustrating as mu computer became unusable since I use Bluetooth devices constantly, notable input and audio.


Anyway to reverse to a previous version of Mac OS?


Thanks anyone for any help.


MacBook Pro 13″, macOS 11.5

Posted on Jul 28, 2021 6:49 AM

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Question marked as Top-ranking reply

Posted on Jul 28, 2021 7:07 AM

Make sure you have a backup before re-installing macOS.


You could try re-downloading the latest Big Sur installation via the App Store and then re-installing on top of your existing installation. Then checking for updates and update to the latest 11.5.1 version.


That should redo all the system files.

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2 replies
Question marked as Top-ranking reply

Jul 28, 2021 7:07 AM in response to Marcello Pereira

Make sure you have a backup before re-installing macOS.


You could try re-downloading the latest Big Sur installation via the App Store and then re-installing on top of your existing installation. Then checking for updates and update to the latest 11.5.1 version.


That should redo all the system files.

Bluetooth not working properly after 11.5 upgrade

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