http://esupport.sony.com/US/p/swu-download.pl?mdl=SVP13215PXB&upd_id=9755&os_group_id=24
Release Date: 4/11/2014
具體更新內容，可能是下面這幾項，不過有幾項之前好像也出現過了。
好啦，總之自己斟酌看看囉！
Enhancements:
Stability of the Bluetooth® is improved
Adds supports for the Windows 8.1 operating system
Reduces fan noise for the CPU and FAN when using the "Silence" mode
Supports the full disk encryption software from McAfee®
