WX1804H Region Code does not include JP

I use WX1840H version 5272 on site, with AP WA538-ww, the JAPAN option cannot be typed in the region code?  

1. Due to Japan's control of wireless frequency bands, the country code for Japanese equipment is locked, and only Japan country code can be used, and other country codes cannot be matched;

2. The AP is divided into Japanese model xxx-jp and non-Japan model xxx-ww. WX1840H model 5272 does not adapt to the ap that supports the Japanese country code, so the Japanese country code cannot be configured globally; only Japan is used Only when the model AP is upgraded to the version that supports the AP can the country code of Japan be knocked out.