# Pneumatic Hub Firmware Changelog

### Version 26.1.3

* Fixes USB compatibility for Mac

### Version 26.1.2

* Fixes bug preventing updating downstream SPARK devices

### Version 26.1.1

* Improves performance of USB bridging

### Version 26.1.0

* Fixes bug preventing proper communication with downstream SPARKs
* Updates the bootloader. This update must be done via DFU.
* Switches the USB CAN bridging to use SLCan
  * Note: Devices that use SLCan are NOT compatible with REV Hardware Client when used over USB. Devices running v26.x.x+ can only be used via REVUI, or downstream of a REV CAN device running v25.x.x or lower with RHC.

### Version 23.0.1

* Fixes issue where compressor channel does not turn on after updating to v23.0.0 without explicitly setting a compressor mode

### Version 23.0.0 <a href="#version-2204" id="version-2204"></a>

{% hint style="warning" %}
Upgrading from `v22.x.x` to this version will clear sticky faults and compressor settings.
{% endhint %}

* Improves device brownout detection
* Improves CAN fault detection
* Improves robustness against soft-bricking

### Version 22.0.5 <a href="#version-2204" id="version-2204"></a>

* Reduces stutters in compressor and solenoids with high CAN utilization

### Version 22.0.4 <a href="#version-2204" id="version-2204"></a>

* Allows compressor test mode for the pressure relief valve without having to send a solenoid command first

### Version 22.0.3 <a href="#version-2203" id="version-2203"></a>

* Disallows actuation from REV Hardware Client if roboRIO was previously connected
* Improves over current protection for larger compressors

### Version 22.0.2

* Improves accuracy of various readings:
  * Analog sensor voltage
  * Battery voltage
  * Compressor current
* Improves performance for larger compressors
* Improves hardware fault reporting
* Adds compressor test mode for the pressure relief valve which is activated via holding the MODE button for 7 seconds
* Blinks the status LED blue when sticky faults are successfully cleared via the MODE button
* Blinks the status LED orange and green when the compressor is over current
* Fixes issue where the device would hang after receiving a malformed CAN frame

### Version 22.0.1

* Fixes certain faults that were incorrectly triggered when the device was only powered via USB

### Version 21.1.7

* Persists sticky faults across power cycles
* Allows sticky faults to be cleared by holding down the device's button
* Updates LED patterns
* Improves accuracy when using the analog sensor to control the compressor


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.revrobotics.com/ion-control/ph/ph-changelog.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.