Thanks for asking, I'm okay with sharing ExtremeWare in a PM here. If the requests get out of hand, we'll adjust.
The last EWare version Extreme published was v784b1-patch1-4. Release Notes are attached.
v784b1-patch1-4.Wxtr
This is the wrapper image for the Summit 200 series switches, also known as the intermediate image. ExtremeWare 7.3e is a much larger image compared to ExtremeWare 7.1e, this image is needed to repartition the flash to store the ExtremeWare 7.3e image and the configuration.It should be used only when upgrading Summit 200-24 and Summit 200-48 switches running a version earlier than release ExtremeWare 7.3e.
Otherwise, use v783b5.Fxtr. It's the regular upgrade for the S200/300 series. If needed s200_boot51.bin is the BootROM for these models.