Have you looking for how to install Official Android 4.0 ICS Update on Sony Xperia Arc LT15i / Arc S LT18i. Both Sony Xperia Arc LT15i and Arc S LT18i were some nice second generation Android Smartphones from Sony. As new ones the third generation has already arrived like Xperia Sola and Xperia S Sony seemed to have lost interest in older devices. Sony says that we have done very hard work to bring ICS update to their phones without any bugs and problems. After lots of request from customer and fans Sony has released Official Final release of Android 4.0 ICS firmware for few of their devices. Xperia Arc and Arc S customer can now enjoy latest Android version on their device. Sony Xperia Arc LT15i and Arc S LT18i has already been updated by OTA but if you have missed it then you can update manually for every region using the below detailed procedure. We have also included the rooting procedure for guys who will want to root their device on ICS.