英文手册：
When the terminal is powered on, press and hold the RESET button for more than 3s,
and then release it. Then the terminal automatically restarts and the default settings are
restored.
翻译下：路由正常使用中，按住“Reset”3秒以上，然后放开，路由会自动重启并恢复默认设置。作者: shanfeng218 时间: 2010-7-16 08:49
UPDATE 01/07/2010: a new firmware is available for the Vodafone Huawei HG556a.
Summary of the major changes since previous firmware version:
Support for Huawei K4505 (HSDPA+) mobile broadband modem stick.
Support for both read and write access when using an attached USB storage device formatted using NTFS.
Fixed the issue whereby no ringing tone is heard for incoming calls when a handset is connected directly to the router.
End users will no longer have the ability to turn on/off support for TR069 and SNMP (both will now remain enabled by default).
The advanced web configuration login details Username: admin // Password: VF-IRhg556
have been replaced with Username: advanced // Password: advanced
Please note! If you have made changes to the default settings for the Wireless, LAN, FTP or Print Server parameters etc. then you should take note of these changes before upgrading the firmware and then manually re-apply them after you have restored the default settings.
