Buffalo WHR-600D Router Firmware 1.50

Fixes:
- Fixed the problem where unstable communication occurs when PPPoE is configured using Internet Connection Wizard.
- Fixed the problem where PPPoE connections 2- and 5 cannot be selected as the default PPPoE connection.
- Fixed the problem where if configuring MAC filtering from a mobile device, multiple MAC addresses cannot be registered at the same time.
- Fixed the problem where Internet Connection Wizard does not work correctly when a HTTPS-protected webpage opens.
- Fixed the problem where if the AC adapter is unplugged while booting AirStation, settings are sometimes initialized.
- Fixed the problem where some products are unable to obtain the IP address from DHCP server.
- Fixed some typos.