First signs of newer Jelly Bean release for Xperia phones
Sony had previously promised Android 4.3 updates for some of its 2013 Xperia devices starting this month, and now a firmware package is available for those wanting to flash it onto the Xperia Z and ZL. The leaked updates are marked as "Commercial & Journalists" releases, meaning they're not necessarily intended for retail devices — but adventurous Xperia owners should be able to flash them onto any international LTE Xperia Z (C6603) or Xperia ZL (C6503) using the proper flash tool.
While it's possible this software build — version 10.4.B.0.569 — will be the same one to officially land via over-the-air updates before the end of the year, there's no guarantee this will be the case, and so caution is advised.
Sony's latest update advisory states that it plans to start updating the Xperia T, TX, V, Z, ZL, ZR, Tablet Z, SP, Z Ultra and Z1 from this month, though there's no sign of any Android 4.3-based firmware for other Sony devices just yet.