---
title: "Updating the XLC4 firmware"
slug: "updating-the-xlc4-firmware"
updated: 2026-09-02T05:49:31Z
published: 2026-09-02T05:49:31Z
canonical: "docs-linescan.alliedvision.com/updating-the-xlc4-firmware"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs-linescan.alliedvision.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Updating the XLC4 firmware

> [!NOTE]
> NOTE - data loss during update process
> 
> Wrong operations during the update process might cause data loss and the XLC4 control unit has to be returned to Allied Vision .
> 
> Contact Allied Vision before starting a firmware update.

> [!NOTE]
> NOTE - personal settings of the XLC4 control unit
> 
> During the update process all saved settings get lost. Check the settings and take notes before starting the update process

## Requirements

- The XLC4 control unit is connected via RS232 port. Ethernet or USB will not work.
- The application “PIC32UBL.exe” is downloaded. Contact Allied Vision support.
- XLC4 Commander installed on the PC.

## Updating

### Erase old firmware

1. Connect the XLC4 control unit via RS232 to the PC.
2. Start XLC4 Commander and establish a connection with the XLC4 control unit.
3. Type the command “UP” in the command line.
4. Click **Send**.

The old firmware is erased.

### Restart the XCL4 control unit

1. Disconnect the XLC4 Commander.
2. Switch off and on the XLC4 control unit.
3. After start-up of the XLC4 control unit the yellow LED blinks.

The bootloader is ready for loading the new firmware.

### Install the new firmware

| 1. Start the application “PIC32UBL.exe”. |  |
| --- | --- |
| 1. Select the *Com Port* and click **Connect**. | ![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/image(32).png) |
| 1. Click **Load Hex File** and select the “HEX”-file of the new firmware. | ![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/image(33).png) |
| 1. Click **Erase-Program-Verify**. The download is started. 1. Wait for the response “Verification successful”. | ![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/image(33).png) |
| 1. Click **Disconnect**. | ![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/image(33).png) |
| 1. Switch off and on the XLC4 control unit. 2. Connect the XLC4 Commander with the XLC4 control unit. 3. Use command VR to check the firmware release. |  |