Sony Xperia Z and Xperia Tablet Z
A visitor looks at the new Sony Xperia phone and tablet through a glass window during the Mobile World Congress in Barcelona.Reuters

Sony, which was earlier criticized for delaying updates for many of its smartphones, is now going on a firmware update spree. The Japanese smartphone maker has started rolling out new Android 4.1 Jelly Bean update for its Xperia S, Xperia SL and Xperia Acro S smartphones.

Confirming the roll out of new Android 4.1 Jelly Bean update for the aforementioned smartphones, sony said in a statement "We've started rolling out the maintenance release for Xperia S, Xperia SL & Xperia acro S*.After making Android JB 4.1 available for these smartphones, we received feedback on a few issues within the build. We're keen to ensure that all our software is as good as it can possibly be, so we've addressed these & improved on a few things..."

The update has been rolled out over the air (OTA) and the official blog of Sony also mentioned that the timing and availability of the update may vary by market and carrier.

The new Android 4.1 Jelly Bean firmware update brings performance and stability improvements. The changes also include boosted connection stability for 2G network data and Google Now can be accessed by long-pressing the home key and enhanced full-HD video recording. It fixes the volume up bug and ensures that the volume up button is fully responsive. Other improvements include economised power consumption and heat dispersion for longer life and corrected juice level notifications, especially when running low.

Earlier this month, Sony's Xperia Z tablet received Android 4.2.2 Jelly Bean update.