Pegasus2 R4 Compatible with macOS 26 Tahoe?

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Robin Horn posted this 24 September 2025

I have a Pegasus2 R4 connected to a Mac Studio (M1 Ultra). The device is working great on macOS 15.7 (with the DEXT driver installed).

Does anyone know if this will continue to work with macOS 26 Tahoe?

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R P posted this 29 September 2025

Hi Robin,

I was unable to update to Tahoe immediatly after it was released, but I have now done so and the DEXT driver works well on Tahoe, no issues have been seen since the update.

The 2019 Mac Pro was also updated and the Pegasus also works well with Intel macOS Tahoe.

alessandro giorgi posted this 26 October 2025

Hi, I've done all the updates for the MBP M4 but still doesn't recognise the R2. The R2 feels the Mac but not the way around. Any suggestions? Tks

Alex

Frank Bosma posted this 27 October 2025

Hi Alex,

please first check the driver installation status on your Mac.

Open a Terminal window and copy/paste below command and post the outcome here:

systemextensionsctl list | grep promise

The outcome should read [activated enabled] for driver 21.1.0

Kind regards,

Frank

Emiel Efdee posted this 5 days ago

Hi Frank, I also have a Pegasus 2 R4. Worked fine with maOS Tahoe 26.0 and 26.1 but currently won't mount anymore with macOS 26.2 RC installed,

When I check the driver in the Terminal I get "com.promise.driverkit.pegasus (21.0.2/1) com.promise.driverkit.pegasus [activated enabled]"

So 21.0.2/1, not 21.1.0 like you mention. I can't seem to find this newer version of the driver. Do you know where to download it? Maybe this is the solution.

Thanks!

Frank Bosma posted this 5 days ago

Hi Emiel,

the 21.1.0 driver version is the DEXT driver for the Pegasus32 range, it is backward compatible with older Pegasus devices.
It can be downloaded from the Pegasus32 support pages or directly via below link:
https://www.promise.com/DownloadFile.aspx?DownloadFileUID=6963

Kind regards,
Frank

 

Emiel Efdee posted this 5 days ago

Thanks! Installed… but my olde Pegasus 2 R4 won't mount with the 21.1.0/1 driver installed. Worked fine two days ago under macOS 26.1, but fails while running the release candidate of 26.1. Maybe thinks will change when the OS update will be officially released next week.

I also haven't seen the 'Legacy System Extension' warning for a while.

 UPDATE: restarted my Mac two times, turned off/on the R4… and it mounted again!

Robin Horn posted this 5 days ago

Thanks for the update emiel. 🤞🤞

Frank: Have you tested 21.1.0 of the driver with 26.2 RC?

 

Robin

Frank Bosma posted this 4 days ago

I did not test 26.2 update yet.

@Emiel, check also the installed firmware on your Pegasus2 R4.
Last available version for Pegasus2 is 5.04.0000.64, update if necessary.

The Legacy System Extension warning is usually triggered by older versions KEXT drivers if still installed on your Mac.

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