I was configuring WiFi today, and experienced two problems:

1. Config update from SD card is not working - the printer reports that config was read correctly (and displays the SSID and password correctly), but after Wi-Fi module reboot it's SSID, IP address and Password remain the same. When i connected to said network and changed those settings through web interface - everything worked fine.
2. The web interface supports changing between AP and STA modes, while there is no such config in file. If the printer is in AP mode, than you can switch in the STA, like I did, though web interface, but there is no way to make it other way around.
   So it would be nice to see this setting in the config. It might be the first in the row, like MODE::SSID::PASS