These days Xiaomi released a new stable firmware version for Mi WiFi Router: 2.10.13 (31.8 MB). The previous stable firmware version was 2.8.19. The firmware for Xiaomi Mi WiFi Mini Router is still at 2.4.9 stable version.
Download latest Android application for Xiaomi Mi Router v.2.2.9 from here. (13 MB). Tip: to use the application in English, make sure that your device system language is English. If not, the application will start in Chinese. It looks like this newer version is chinese only.