> For the complete documentation index, see [llms.txt](https://support.powerio.com/hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.powerio.com/hub/downloads/en/powerio-downloads/h1.m300-firmware.md).

# H1.M300

<figure><img src="/files/9038782f89ea7b80b4f57e84f242c459801a756c" alt="H1.M300" width="375"><figcaption><p>H1.M300 Device</p></figcaption></figure>

### Current version - Firmware

<details>

<summary>5.2 - Firmware - <a href="https://dl.powerio.com/downloads/powerIO-h1m300-firmware-5.2.piop" class="button primary" data-icon="arrow-down-to-line">Download</a></summary>

Release Date 18.08.2026

**Bug fixes and improvements**

* General stability improvements
* **Fix for startup after FW update**

</details>

***

### Older versions - Firmware

<details>

<summary>5.1 - Firmware</summary>

Release Date 06.08.2026

**New features and changes**

* **powerIO Orbit**: The web interface consistently uses the name powerIO Orbit instead of powerIO Portal.
* **Serial interfaces in the dashboard**: The serial interfaces are referred to in the dashboard as Serial Port instead of M12 Port.

**Bug fixes**

* **Manual time setting**: Manual setting of the time and taking over the browser time are now reliably written to the hardware clock. Previously, this failed without any feedback.

</details>

<details>

<summary>5.0 - Firmware - <a href="https://dl.powerio.com/downloads/powerIO-h1m300-firmware-5.0.piop">Download</a></summary>

Release Date 22.07.2026

{% hint style="info" %}
First official firmware version for the H1.M300.
{% endhint %}

**New features and changes**

#### **Security**

* **Signed firmware packages**: Firmware updates (PIOP) are signed starting with version 5.0 and are checked on the device before installation. Packages without a valid signature are rejected.
* **HTTPS encryption**: Can be optionally enabled with automatic certificates and custom certificates.
* **Flexible access control**: HTTP, HTTPS and SSH configurable individually.
* **API keys for external systems**: Access to the device API via individually assignable and revocable API keys, without passwords in scripts or configuration files.

#### **System**

* **64-bit platform**: System fully designed for 64-bit (arm64) for the Raspberry Pi Compute Module 5.
* **WLAN dongle support**: USB WLAN adapters are recognized immediately and can be used to access the device securely via Mobile App or web interface. Configuration is done via the network settings of the web interface.
* **Automatic recovery**: Crashed services restart automatically, and the system continues running without intervention.

#### **Serial communication and Modbus**

* **4x RS485 usable as standard**: Modbus and Transparent Mode are available on all four serial interfaces.
* **Optimized Modbus communication**: Interframe timing according to the Modbus specification and improved stability during parallel queries.
* **Transparent Mode**: Use serial interfaces (Serial/TCP) directly over the network.
* **Serial port status display**: The status of the serial interfaces is displayed in the web interface.

#### **powerIO Orbit connection (Optional)**

* **powerIO Orbit connection**: Connection to powerIO Orbit with encrypted transmission.
* **powerIO Orbit device registration**: Registration of powerIO devices.

</details>


---

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