# Pro 3 : Toggle Protocol

<figure><img src="/files/M9nBq9Jmvt63ibCpksk3" alt=""><figcaption></figcaption></figure>

The Pro 3 keyboard supports both Gemini and TX Bolt protocols but is in Gemini by default.&#x20;

**How to toggle**

1. Plug in the keyboard.
2. Press and hold **S (both left S keys) + D + Z** together for \~5 seconds. (Red keys in image above).
3. Watch the LED next to the USB port:
   * **Rapid flashing** = **TX Bolt** is selected
   * **Slow flashing** = **Gemini PR** is selected
4. Release. The keyboard **remembers the mode** even after it’s unplugged.
5. Repeat the same key chord any time to switch back.

**Compatibility**

* **Gemini PR:** digitalCAT, Eclipse, Plover
* **TX Bolt:** Case CATalyst (choose **Baron Realtime**), Plover

**Tips**

* Close other steno apps before connecting; only one program can use the COM port at a time.
* If the LED doesn’t start flashing, keep holding the chord until it does, then release.


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