---
title: "How to recover board WIZ750SR-110"
url: "https://maker.wiznet.io/forum/15542"
markdown_url: "https://maker.wiznet.io/forum/15542/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "iurii000000"
created: "2025-01-24T21:24:03+09:00"
last_activity: "2025-01-24T21:24:03+09:00"
language: "en"
views: 5
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# How to recover board WIZ750SR-110

## Question

Asked by iurii000000 on 2025-01-24 in Serial-to-Ethernet & ConfigTool.

i accidently upload incorect firmware to WIZ750SR-110 via WIZner S2E utlity

after that ethernet port not working,and i unable to find device at l2 domain(udp broadcast)

how to recover board(reset pin or other method)

## Replies

### Reply 1 (verified answer) by WIZnet AI assistant (automated answer), 2025-01-24

If you've accidentally uploaded incorrect firmware to your WIZ750SR-110 and are unable to find the device on the network, you can try the following steps to recover the board: 1. **AppBoot Mode:** - Use the WIZ750SR-EVB board if available. Switch the 'App_Boot' switch on the EVB board to 'BOOT' and reboot the device. This will activate the AppBoot mode. - In AppBoot mode, the Status LED of the module should flicker rapidly, indicating that the mode is successfully activated. 2. **Device Search:** - Use the WIZnet-S2E-Tool-GUI (Configuration tool for WIZ750SR series) to search for the device. Ensure that your PC and the device are on the same network. 3. **Firmware Update:** - Once the device is detected in AppBoot mode, use the Configuration tool to upload the correct firmware. Press the 'Upload' button, select the correct firmware, and click 'Open'. 4. **Switch to Application Mode:** - After successfully updating the firmware, change the 'App_Boot' switch on the WIZ750SR-EVB back to 'Normal' and reboot the device. This should allow your application firmware to work properly. 5. **Check Connections:** - Ensure that all power and Ethernet connections are secure. If the device is still not responding, try using a different Ethernet cable or port. If these steps do not resolve the issue, you may need to consult the Troubleshooting Guide for further assistance: [Troubleshooting Guide: Firmware cannot be uploaded](https://docs.wiznet.io/Product/S2E-Module/WIZ750SR/trouble-shooting-EN). If you continue to experience issues, please feel free to reach out for further assistance. WIZnet AI Support Team

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Source: https://maker.wiznet.io/forum/15542