Hi,
The LPC54608 SDK includes the LPC54608J512BD208 and LPC54608J512ET180, so the example should work for your device.

Like you mention, I suggest to check the lwip_httpsrv demo application, this demonstrates an HTTPServer on the lwIP TCP/IP stack with bare metal SDK or FreeRTOS.
The user uses an Internet browser to send a request for connection. The board acts as an HTTP server and sends a Web page back to the PC.
In order to modify the web page, you need to modify the index.html (~\middleware\lwip\src\apps\httpd\fs)
Have a great day,
Sol
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