--- title: Installing Control 2 Native for Symphony I/O MkII Thunderbolt description: In this article, we explain the installation process for Control 2 software, as well as updating firmware for the Symphony I/O MkII via Thunderbolt --- [Skip to content](https://knowledge.apogeedigital.com/installing-control-2-native-for-symphony-i/o-mkii#main-content) English Show submenu for translations [Contact us](https://knowledge.apogeedigital.com/kb-tickets/new?hsLang=en) ![Apogee Logo White.png\]](https://knowledge.apogeedigital.com/hs-fs/hubfs/Apogee%20Logo%20White.png?height=40&name=Apogee%20Logo%20White.png) Open main navigation Close main navigation - English Show submenu for translations - [Contact us](https://knowledge.apogeedigital.com/kb-tickets/new) - Go to apogeedigital.com Go to apogeedigital.com How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://knowledge.apogeedigital.com/?hsLang=en) 2. 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[Getting Started](https://knowledge.apogeedigital.com/symphony-i-o-mk-2?hsLang=en#getting-started) # Installing Control 2 Native for Symphony I/O MkII Thunderbolt ## In this article, we explain the installation process for Control 2 software, as well as updating the Symphony I/O MkII via Thunderbolt ![apogee-symphony-io-mkii-thunderbolt-no-modules-rear](https://knowledge.apogeedigital.com/hs-fs/hubfs/apogee-symphony-io-mkii-thunderbolt-no-modules-rear.png?width=670&height=251&name=apogee-symphony-io-mkii-thunderbolt-no-modules-rear.png)There are a few new steps when installing this new version of Control 2 for Symphony I/O MkII Thunderbolt users compared to the previous Control software.  If you have Dante, and just need to update your firmware, check this article instead:  [Updating Symphony MkII firmware via Dante](https://knowledge.apogeedigital.com/updating-symphony-mkii-firmware-via-dante?hs_preview=JupByDDU-166121959023&hsLang=en) ### **Control 2 Native Software:** #### **Uninstall first!** First, you'll want to run the included UN-installer. This will uninstall all Apogee software to ensure you have a clean install. If you had the previous "Symphony Control" software installed, then please follow these important steps EXACTLY: 1. Unplug the Thunderbolt cable between the Symphony and computer. 2. Restart the computer 3. When the computer is running again, open the Control 2 download and run the **UNINstaller** app that is inside. 4. When Uninstall is complete, RESTART your computer again. **Do not skip the uninstall step!** If the previous Symphony Control software isn't uninstalled, in EXACTLY the way described above, it can cause conflicts with the new Control 2 which uses DEXT instead of KEXT. Click [here](https://knowledge.apogeedigital.com/kext-vs-dext?hsLang=en) to learn more about DEXT & KEXT. **Optional check: is an old Symphony driver staged on your Mac?** If you previously installed Symphony Control on this Mac, or this Mac was set up from an older Mac using Migration Assistant, a copy of the old KEXT driver may remain in a protected macOS staging area even after uninstalling. After completing the uninstall steps above, you can check: 1. Open System Information (Applications \> Utilities \> System Information, or Apple menu \> About This Mac \> More Info \> System Report). 2. In the sidebar under Software, click Extensions. The list can take a minute to load while it says "Gathering information". 3. Look for an extension named ApogeeSymphonyIO2T. ![Screenshot 2026-07-10 at 3.03.06 PM](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202026-07-10%20at%203.03.06%20PM.png?width=670&height=427&name=Screenshot%202026-07-10%20at%203.03.06%20PM.png) If ApogeeSymphonyIO2T still appears in the list after uninstalling, a staged copy of the old driver is present. It can cause kernel panics or prevent the Symphony I/O MkII from being detected even after a clean Control 2 install. See the article: [How to clear a staged Apogee kernel extension on Apple Silicon Macs](https://knowledge.apogeedigital.com/how-to-clear-a-staged-apogee-kernel-extension-on-apple-silicon-macs?hsLang=en) If ApogeeSymphonyIO2T is not listed, no staged driver is present and you can continue to installation. #### **Then Install:** Open the Control 2 download and run the Installer. On the "Custom Install" screen (Installation Type step), enable the checkbox labeled "Support for Symphony I/O MkII". This checkbox must be checked or the Thunderbolt driver will not be installed. ![Screenshot 2024-05-30 at 3.26.27 PM](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-05-30%20at%203.26.27%20PM.png?width=400&height=287&name=Screenshot%202024-05-30%20at%203.26.27%20PM.png) Click Continue and proceed through the remaining prompts. You'll be prompted for your computer password, to allow the installer to modify files, and to restart. If a dialog appears that says "Installer Would Like to Modify Apps on your Mac", click Allow. ![Installer would like to modify apps on your mac allow button](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-06-04%20at%207-14-25%E2%80%AFPM-png-1.png?width=458&height=359&name=Screenshot%202024-06-04%20at%207-14-25%E2%80%AFPM-png-1.png)   After you restart, you'll get a prompt that an extension needs approved. ![System Extension Blocked](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-06-04%20at%207-15-26%E2%80%AFPM-png.png?width=448&height=457&name=Screenshot%202024-06-04%20at%207-15-26%E2%80%AFPM-png.png)   Click the option to Open System Settings and Approve the Apogee Extension. You'll be prompted for your computer password again. This is what installs the DEXT. ![Allow Button Dext](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-06-04%20at%207-15-40%E2%80%AFPM-png.png?width=535&height=474&name=Screenshot%202024-06-04%20at%207-15-40%E2%80%AFPM-png.png)  --- On macOS 15 Sequoia and newer, an additional step is REQUIRED. In System Settings, go to General \> Login Items & Extensions. ![](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-11-06%20at%2011-58-47%E2%80%AFAM-png.png?width=455&height=611&name=Screenshot%202024-11-06%20at%2011-58-47%E2%80%AFAM-png.png) Scroll down to the Driver Extensions section and click the i button on the right ![](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-11-06%20at%2011-54-46%E2%80%AFAM-png.png?width=459&height=616&name=Screenshot%202024-11-06%20at%2011-54-46%E2%80%AFAM-png.png) Toggle the ApogeeTBTDextInstaller.app to the ON position, then click Done. ![](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-11-06%20at%2011-55-04%E2%80%AFAM-png.png?width=439&height=498&name=Screenshot%202024-11-06%20at%2011-55-04%E2%80%AFAM-png.png) --- ### Update Symphony I/O MkII Thunderbolt Firmware: If a prompt message appears that your firmware doesn't match the installed software, then head to Applications \> Utilities and find the Symphony updater: ![Screenshot 2024-05-30 at 3.28.46 PM](https://knowledge.apogeedigital.com/hs-fs/hubfs/Screenshot%202024-05-30%20at%203.28.46%20PM.png?width=670&height=319&name=Screenshot%202024-05-30%20at%203.28.46%20PM.png) Select Thunderbolt only: ![Screenshot 2024-05-30 at 3.29.07 PM](https://knowledge.apogeedigital.com/hs-fs/hubfs/Knowledge%20Base%20Asserts/Symphony%20IO%20mkII/Screenshot%202024-05-30%20at%203.29.07%20PM.png?width=408&height=291&name=Screenshot%202024-05-30%20at%203.29.07%20PM.png) Follow the prompts until the firmware update is complete. 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