> ## Documentation Index
> Fetch the complete documentation index at: https://devzone.nayax.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Flow & Configuration
> Answers to common questions about activating, connecting, configuring, and updating Marshall Pro devices.
## Connecting the device to your POS or simulator
To connect to the device, use the TCP protocol through port 5050. No physical connection to your computer is required.
For your device's Wifi connection setup, see [Configuring Wifi (and IP)](/docs/integrate-pos-device/marshall-pro/faq#configuring-wifi-and-ip) below. For LAN, see [Configuring ETH (and IP)](/docs/integrate-pos-device/marshall-pro/faq#configuring-eth-and-ip).
### Activating the device
Scan the QR code displayed on the device's screen using your phone's camera.
You're redirected to a landing page where you enter the required details. After submission, a verification code is sent by email. Enter it on the landing page to complete the device activation.
### Getting the device's details (serial number, IP)
Disconnect the link to the device and wait 30 seconds.
Click five times on the top-right corner of the screen, then select **Device Info**.
Device Info shows the device's serial number, along with its cellular and Ethernet communication details. In this example, the device has an eSIM and is also connected to Wifi.
To return to the device's idle screen for making transactions, click the top-left arrow, then select **Payment App**.
### Configuring wifi (and IP)
VPOSM over Marshall supports either DHCP or Static IP, depending on how you want the device to work. DHCP is the default.
Click 5 times on the top-right corner of the screen, then select **Technician Menu**.
Enter the code (123123 by default), then scroll down to the **Communication** section.
Select **Wifi**, then select the relevant network.
Click the gear icon for the relevant network, then select **Advanced**.
Scroll down to **IP Settings**, which is set to DHCP by default, and switch it to **Static**. Fill in the IP details.
### Configuring ETH (and IP)
On the Wifi settings screen, tap the back arrow at the top-left to return to the device's system settings.
Tap **Network & Internet**.
Tap **Ethernet**, then turn it on using the toggle. Tap the Ethernet row again to open Ethernet Settings.
In Ethernet Settings, select **Static**, then fill in the IP details.
## Triggering the apps update process (accessing the CasHub app)
Nayax Fuel initiates firmware updates from a separate platform called CasHub. The update process updates each relevant application individually, rather than as a single package, in two stages: download and update.
Once the download finishes, Nayax Fuel's support team sends the device a request to start the update for the desired applications. You can also trigger the update yourself. Turn on the device and use one of the following options:
1. Leave the device powered on overnight. It resets automatically at approximately 3-4 AM, at which point the device collects and starts the updates.
2. Manually access the CasHub app to trigger the download and installation of the updates.
To trigger the update manually, follow these steps:
Disconnect the link to the device and wait 30 seconds.
Click five times on the top-right corner of the screen, then select **Technician Menu**. Enter the password 123123.
Scroll down to **Dev Mode** and enter the password 321321.
Select **Wifi**, then select the back arrow to return to the Android settings.
Go to **Apps & Notifications**, then select **See All Apps** (in this example, the device has 24 apps).
Select the CasHub app and open it.
Click **Status**, then select the three dots in the top-right corner and choose **Connect**.
The screen displays "Connecting..." both at the top and in the table below. If this persists for more than one minute, the process has likely stalled.
The download and update of the apps begins.
Once all apps finish downloading and updating, a "Finished" line appears.
Some apps can only be downloaded, not installed, at this stage, since the device can't update applications that are currently running. This applies to:
* Nayax Fuel FuelApp
* Nayax Launcher
* Update Service
* VPOS Service
For these, **reboot** the device afterward. The apps update during the device's power-up sequence, and a "Castles: Updating (application)" notification appears for about one minute.
**"vpos\_media keeps stopping" error**
This error happens because the Vendapp crashes, which isn't relevant to your setup. This can occur if the Vendapp is set as the default application:
or if the relevant parameter value is empty or missing (in either case, the device defaults to Vendapp). If the parameter is correctly set to Fuel and you still get this error, update the Vendapp.
