Pegasus2 R2+ and Mac OS Catalina

  • Last Post 01 June 2020
Howard Womersley posted this 15 April 2020

Hi folks,

I currently use Mac OS Mojave 10.14.6 and have a Pegasus2 R2+ connected via Thunderbolt.

And currently using Promise Utility ver 4.02.0000.21

Is it correct that the Promise Utility for this unit is still not compatible with mac OS Catalina?

Researching before updating...


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  • MIke Malherbe
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Raghuraman Kannan posted this 17 April 2020

Hi Howard,

Yes, you are having the correct version of the Utility. Pegasus 2R2+ units will mount with OS Catalina but the Utility is something which will not load.

Thanks ! 

Howard Womersley posted this 27 April 2020

Do you know if they are planning on updating the Utility?

Dario Pettina posted this 27 April 2020

Hello folks,

As much of us, my access to the Pegasus 2 R4 is no longer possible. 

I was working with IMAC PRO; Mac OS 10.15.4

Please let me know what can of help can I ask, or what to expect about new drivers o utilies. Everything es locked and the drive doesnt mount .

Best regards and thanks in advance for any answer

Dario from Argentina

Mike Malherbe posted this 06 May 2020

Same problem that Dario has. 


Ranjith kumar posted this 06 May 2020

Hi Dario,

-What is the power light status and drive light status?

-Is there any recent changes in Mac OS such as update?

-Check with swapping the Thunderbolt cable at different port of Pegasus and Mac.

Please reach us through for further assistance.

Thank you,



Promise Team

Mike Malherbe posted this 06 May 2020

HI Ranjith.

I can't connect with the Pegasus 2 R2+ as well. The Blue power lights and the drive lights are on. I have tried both the slots for the thunderbolt as well as the USB. The Utility also appears to be not working. Firmware OK, new Utility loaded. Mac os Catalina 10.15.4. Thanks for the help. MIke


Howard Womersley posted this 01 June 2020

I got a response from Promise Support.

The Promose Utility that works with the Pegasus2 R2+ is still not compatible with Mas OS Catalina (10.15). Their suggestion is to not upgrade to Catalina until the new utility is available. But they also do not have an esitmate of when this will be.

Catalina was released in October 2019. The Pegasus2 R2+ is still a current product. If it has not been done in 8 months, it would not be unreasonable to presume that it may not be happening.

Just so others are aware, I used the 'Check For Updates' feature within the Promose Utility - that resulted in the Utility updating to a newer version that does not seem to be compatible with the Pegasus2 R2+. It resulted in a frozen system, and I had to install an earlier version of the Promise Utility. So, I suggest not using that built-in feature. Only download from the correspoding product page on their website.

If you have already upgraded to Catalina, unsure what they suggest.

Ethelyn Carter posted this 01 June 2020

In Mac OS Catalina I find that the Promise Utility does not operate completely correctly, i.e. failing to save a Subsystem Service Report after clicking on Save, and I find that after rebooting into OS Catalina