Hello!

As Wiznet W5200 is not recommended anymore for new designs (https://www.wiznet.io/product/tcpip-chip/) and the W5200 is difficult to find, and W5500 is very easy to find and W5500 supported too by driver (https://docs.micropython.org/en/latest/library/network.WIZNET5K.html?highlight=w5500), maybe can be a good way to add the firmware build (in the next builds > 1.18) to download page - supporting the W5500 and W5200. Actually the Pyboard Lite download page and the Pyboard download page has just the W5200 firmware -> Firmware (Wiznet 5200 Driver).

1. Add a firmware build maybe is better than just change from W5200 to W5500 because people that are already using the W5200 will break.
2. In my case that are starting now with projects/applications that needs LAN support for the Pyboard Lite, Pyboard and Pyboard D series, I will use the driver just for the W5500, not W5200. So, there is a ready new firmware build with W5500 support will be easy for new users starting with ethernet on the Pyboard Lite and Pyboard. And in this case for Pyboard D series, where MicroPython firmware has no Wiznet driver included by default, people that need ethernet support, will need just to build own firmware with W5500 driver.

Ps: I do not know if that Wiznet driver works on the Pyboard D Series too. If anyone has build own firmware with that driver and worked, please let me know!

Edit:
Will be great if there is a ready firmware build for the Pyboard D series download page supporting the Wiznet Ethernet, like as exists for Pyboard Series.

Thank you!