What are the instructions to install a new firmware in a scalance X204-2? I have already the file with the firmware versión I need, but I do not know how to install...

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Split from Scalance x208 firmware-update communication problems.

Hello,
The X204-2 is a manageable switch and it has an integrated WEB Server.
You need to know what IP address the switch has, or assign it an IP address if this is not done.
To set the IP address, you can use the primary setup tool.

Then you open a web browser and you surf the address http://<ip address of the switch>

You make a login (by default user=admin, pw=admin).

On the left side of the screen you see a navigation tree.
Got to load/save.

There you can browse to the new firmware file and start the update.

At the end, the switch will reboot. So, be aware that you than loose contact for a few minutes.

See in this manual, chapter 5.1.4