There is no release notes for this release. I was only able to get N2200Plus_FW_1.00.00.43.rom to load. The hyperlink for N2200Plusfactory.1.00.00.43.zip downloaded to my Appel Mac as N2200Plusfactory.1.00.00.43.bin. I was not able to unpack the file further to see what was in the package.
I upgraded from v1.00.00.39 to .43 but can see no obvious changes or bug fixes. However, the system has been stable and the things that work continue to work.