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Windows 10 Anniversary Update 2016 - Processor: 1.2 gigahertz (GHz) or faster with support SSE2 - RAM: 2 gigabyte (GB) for 1 DisplayLink display. 4 GB or more recommended for 2 or more DisplayLink displays - USB: At least one USB 2.0 or USB 3.0 port. 30 megabytes (MB) of free disk space. Following update to Big Sur, which also updates the firmware, my MacBook Pro 15 late 2013 will not boot if the Thunderbolt Display is connected. I can downgrade to Catalina but the firmware is not downgraded and the problem remains. I have reported it to Apple Support but wonder if anyone else is experiencing the same issue.

1. Thunderbolt Display Firmware Update Catalina Download
2. How Do I Update Thunderbolt Firmware
3. Thunderbolt Display Firmware Update Catalina Update
4. Thunderbolt Display Firmware Update Catalina Version
5. How To Update Thunderbolt Display Firmware

The newly released macOS 10.15.4 Catalina update for Mac has delivered improved support for any high dynamic range monitor as well as customized reference modes for the Pro Display XDR.
After updating to 10.15.4, users with monitors that support high dynamic range -- or HDR -- will now see a checkbox within the Display section of System Preferences. Ticking this box will automatically adjust the display to show high dynamic range content.

As it pertains to Apple's Pro Display XDR, the new customized reference modes came as a firmware update to the monitor itself. There does not appear to be any way to get the firmware update, without having macOS 10.15.4.
Apple highlighted the change in the macOS 10.15.4 release notes. The company specifically noted 'customized reference modes that you can tailor to specific workflow needs by selecting from several color gamut, white point, luminance, and transfer function options.'
Additionally, Apple has published a new support document that explains how to use the new reference modes. These modes will allow advanced users to create tailored modes for different workflows by choosing different 'color gamut, white point, luminance, and transfer function options'.
Stability improvements are also found in the 2.2.2 Pro Display XDR firmware.

Comments

• I have my mini with 10.15.4 hooked up to an HDR tv and I don't get that option.

• I have my mini with 10.15.4 hooked up to an HDR tv and I don't get that option.

  We've seen it on a Mac mini connected to a TV through a receiver, a Mac Pro connected to a 4K HDR display, and several MacBook Pro models connected to a HDR display. Without standing in front of your hardware, I suspect that your HDMI cable can't handle the bitrate, isn't plugged into what may be the only HDR-compatible port, or HDR isn't enabled on the television.

  edited March 2020
• And finally the support for my eGPU is back... I use a Sonnet eGFX Breakaway box and and RX 580 on a 2019 13' MacBook Pro. Before Catalina, everything worked perfectly. Since Catalina, I was unable to start with the eGPU plugged in and many programs would ignore it unless in clamshell mode. Not to mention many other glitches that were fixed gradually in .2 and .3 revisions, but this one was by far the worst for my workflow. I swear I will never, ever, ever, ever, ever again update the MacOS before the .4 revision.

• And finally the support for my eGPU is back... I use a Sonnet eGFX Breakaway box and and RX 580 on a 2019 13' MacBook Pro. Before Catalina, everything worked perfectly. Since Catalina, I was unable to start with the eGPU plugged in and many programs would ignore it unless in clamshell mode. Not to mention many other glitches that were fixed gradually in .2 and .3 revisions, but this one was by far the worst for my workflow. I swear I will never, ever, ever, ever, ever again update the MacOS before the .4 revision.

  Probably good policy. I still haven’t upgraded either of my “working” Macs to Catalina. I plan to hold off until the betas of this years Mac OS are coming out. No rush here.
• Updating to the latest Catalina immediate made my 3 external LG monitors look like trash. I had to turn off HDR to make them look decent again. 2 of the monitors running off an eGPU are running OK after turning off HDR, but the 3rd is ALWAYS receiving an HDR signal no matter how I set the settings. So annoying! Hope Apple fixes this soon.

  edited March 2020
• Well that was fun! My MacMini is hooked up using a Thunderbolt to DP cable and after the update I got a black screen. Couldn’t see anything in safe mode or recovery mode or internet recovery mode... In desperation I robbed the HDMI cable from our TV - it worked. Haven’t investigated HDR settings. Perhaps this was the cause?
• I have the late 2019 Mac Pro running Catalina 10.15.14 with the Apple Pro XDR Display. Supposedly there is a firmware update to version 2.2.2 for the Pro XDR Display. I have shut down the Mac, started it back up, disconnected the Pro XDR Thunderbolt cable and reconnected. I have not been offered the new firmware and I have confirmed that I am still on the original firmware that shipped with the Apple Pro XDR display. Has anyone with a late 2019 Mac Pro and the Pro XDR display been offered the firmware update for this monitor?
  Tom
• “Perhaps this was the cause?“

  Well it does look like it was some kind of display profile issue. I changed some settings and it seems to work fine with DP again. Shame it couldn’t fail more gracefully...
• Well this is update is buggy as hell on my late 2012 iMac. 10.15.3 was great no issues and now computer is crashing and seeing the spinning wheel of death when opening applications. No good. Hope they have a fix on the way. Stupes😭
  

After spending quite a bit of time fixing an issue with my Thunderbolt, that was shutting down randomly, I finally figured out a fix without going to Apple repair. Hope this will be of help to you too!

Update your Mac to the latest version of OS X

1. Click on the Apple logo in the top-left menu;
2. Click on About This Mac in the drop down menu;
3. Click on the Software Update;
4. Click on the Update button next to the latest OS X version in the Mac App Store.

Thunderbolt Display Firmware Update Catalina Download

Reset SMC

Intel-based Macs have a System Management Controller (SMC) that can be reset as a possible fix for Thunderbolt Display issues.

1. Shut down the Mac;
2. Plug in a MagSafe or USB-C power adapter to a power source and to your computer;
3. On the Mac’s built-in keyboard, press the left side Shift-Control-Option keys and the power button simultaneously;
4. Release all the keys and the power button at the same time;
5. Press the power button to turn on the Mac.

On Macs with MagSafe power adapters, the cable’s LED might change states or temporarily turn off when you reset the SMC.

Reset Your Mac’s NVRAM or PRAM

1. Shut down the Mac;
2. Turn on the Mac while pressing and holding the Command-Option-P-R keys;
3. Keep holding these keys until the Mac restarts and you hear the startup sound for a second time;

Power Cycling

Shut down and disconnect both your Mac and Thunderbolt Display from AC power 30-50 seconds.

1. Disconnect the Thunderbolt Display’s cable from your Mac;
2. Disconnect the Thunderbolt Display from AC power;
3. Disconnect all USB peripherals and any cables plugged into the Thunderbolt Display;
4. Wait at least 30 seconds before powering on your Mac and Thunderbolt Display.

How Do I Update Thunderbolt Firmware

Thunderbolt firmware update (for older OSX)

Thunderbolt Display Firmware Update Catalina Update

Follow this link to download the Thunderbolt Firmware update

Thunderbolt Display Firmware Update Catalina Version

Separate Thunderbolt cable

How To Update Thunderbolt Display Firmware

It is not unusual for the thunderbolt cable to get damaged over time (due to bending). Try connecting using standalone thunderbolt cable (can be purchased from Apple).