> For the complete documentation index, see [llms.txt](https://commanderhelp.verifone.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://commanderhelp.verifone.com/customer-documentation/petro-and-c-store/pin-pads/implementation-guides/m425a/software-installation.md).

# Software Installation

## Software Installation

EVPay arrives pre-installed on the M425A. A setup visit is still required before the terminal can process payments.

A Verifone technician or designated setup contact completes the following steps.

{% stepper %}
{% step %}

### Confirm the operating system

Confirm the Android version is approved for the production site. Apply any required OS update.
{% endstep %}

{% step %}

### Configure the network

Configure the IP address, gateway, and DNS. Connect the terminal to Commander through Wi-Fi or Ethernet.
{% endstep %}

{% step %}

### Load the identity certificate

Install the terminal identity certificate. This certificate identifies the terminal to Verifone services.
{% endstep %}

{% step %}

### Load encryption keys

Load debit PIN encryption keys securely using TR-34. Keys are unique to each terminal.
{% endstep %}

{% step %}

### Configure VHQ

Point the terminal to its correct VHQ instance. Petroleum terminals normally use PetroHome VHQ.
{% endstep %}

{% step %}

### Apply Commander configuration

Apply payment settings, prompts, and fleet parameters through Commander Configuration Client.
{% endstep %}

{% step %}

### Complete test transactions

Test chip, contactless, magnetic-stripe, and debit PIN transactions before going live.
{% endstep %}
{% endstepper %}

{% hint style="info" %}
Replacement terminals require the full setup process. They do not inherit certificates, keys, or settings from the replaced terminal.
{% endhint %}

### Software updates

M425A terminals receive approved EVPay and configuration updates through VHQ. Updates normally run during scheduled maintenance windows.

* The terminal waits until no transaction is active.
* It restarts automatically after the update.
* Commander can also trigger an approved on-demand update.

Do not disconnect power while an update is running.


---

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