---
title: "WIZ550io firmware."
url: "https://maker.wiznet.io/forum/14481"
markdown_url: "https://maker.wiznet.io/forum/14481/md"
type: "Forum topic"
category: "IO Modules"
author: "gogo10"
created: "2022-02-22T02:19:54+09:00"
last_activity: "2022-02-23T16:56:12+09:00"
language: "en"
views: 568
replies: 3
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# WIZ550io firmware.

## Question

Asked by gogo10 on 2022-02-22 in IO Modules.

Please. How to load firmware into WIZ850io module?
Thank you.

## Replies

### Reply 1 by irina, 2022-02-22

Wiz850io and Wiz550io not include the MCU.
In my opinion, it would be better to think of it as a sensor module that provides an SPI interface.

### Reply 2 by gogo10, 2022-02-23 (in reply to reply 1)

Hi, the question was based on information:

![](https://maker.wiznet.io/forum_uploads/wiznet/original/2X/3/34574cab8892efabe97a6df2c46186f436230a95.png) [shop.wiznet.eu](https://shop.wiznet.eu/wiz850io.html)

### [WIZ850io | WIZnet Germany GmbH](https://shop.wiznet.eu/wiz850io.html)

<h2>Compact size network module based on the W5500</h2> <h3>Product Description</h3> <p>WIZ850io is an compact size network module that includes a <a href="https://shop.wiznet.eu/w5500.html" title="link to w5500">W5500</a> (TCP/IP hardwired chip...

### Product Description

WIZ850io is an compact size network module that includes a [W5500](https://shop.wiznet.eu/w5500.html) (TCP/IP hardwired chip with embedded PHY) a transformer and RJ45. The module is designed to be a fully pin-compatible replacement of the [WIZ820io](https://shop.wiznet.eu/wiz820io.html) which has been widely used in the market over the last few years. The WIZ850io has a very small form factor and is just a little bigger than a usual RJ45 connector. The connection from the WIZ850io to your microcontroller is done by SPI mode 0 & 3. Already existing projects with the WIZ820io can be transformed to be used with the WIZ850io by modifing the firmware.

Thanks.

### Reply 3 by gogo10, 2022-02-23 (in reply to reply 1)

That is, unless it is intended by modifying the project firmware.

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Source: https://maker.wiznet.io/forum/14481