upgrade bluetooth 2.1 on imac mid 2011

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I want to upgrade my bluetooth 2.1 on my imac mid 2011 by bluetooth 4.0.
 

bobtomay

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Your Mac's Specs
15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
Buy a plug in adapter - something like this.

Need to read reviews yourself to find one that will work with OS X.
 
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Your Mac's Specs
2019 iMac 27"; 2020 M1 MacBook Air; macOS up-to-date... always.
I want to upgrade my bluetooth 2.1 on my imac mid 2011 by bluetooth 4.0.

Why? If it's to enable features like Handoff in Yosemite, that won't work over a USB dongle. I did some reading and a number of people are reporting in other forums that they have been successful in getting Handoff to work on 2011 MacBooks by replacing the Bluetooth card internally and modifying a system kext file. Here's one post explaining what was done:
[How To] Enable Handoff/Continuity in Yosemite on unsupported Macs. : osx

Here's a more comprehensive discussion on the matter.
Handoff Breakdown With Activation Tool - MacRumors Forums
 
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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
If your are running Yosemite Bluetooth version is 4.3.1f2 on that model iMac. What operating system are you actually using? May be time to upgrade.
 

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