I am editing the article about this router in the Wiki.
For now I know about two versions: 8M which is sold in Europe, and 16M which is sold in Russia (sometimes called WNR2200-100RUS), and probably China.
So, if you have a router bought in China, can you tell if it has some different marketing name? Does it indeed have 16M flash?
OpenWrt creates factory-NA.img image, which only difference is
region:NA line in the 128 byte vendor header. (you can read it by using head -c128 factory.img, it consists of plain text padded to 128 bytes by 00 bytes).
So if you are from North America, can you tell, what is difference and is it possible to flash regular openwrt-*-wnr2200-squashfs-factory.img or region:NA field is mandatory?
Where can I download Netgear official firmware updates for North America version for comparison?
Maybe other countries have regional versions I do not know about too?