This is good time to update Xperia Arch and Xperia Arc S to Android 4.0.4 Android ICS even a few days ago Sony just starting to roll out the official Android 4.0 ICS update to the Xperia Arc S. But the official update not for all region even Sony promise to spread the update to all region.
Now you will have latest update based on Android 4.0.4 for Xperia Arc and Xperia Arc S but the update is unofficial.
The unofficial custom ROM Android 4.0.4 update for Xperia Arc and Arc S based on the most popular CyanogenMod 9 ROM. It called as BoostHD ROM. The BoostHD aims to provide a mother UI and longer battery life that very important to keep you always keep in touch with the Xperia phone compare with the charger. Also, the custom ROM for Xperia Arc and Arc s brings along performance improvements such as minfree adjustment, I/O tweaks, VM tweaks, SD Card Read Speed tweaks, JIT tweaks etc, and better customization options

The ROM and the guide to update Xperia Arc and Arc S to Android 4.0.4 Android ICS below only for both Xperia Android phone with model number LT15i and LT18i. So, if you have no both phone, please stop to reading this article and try our search bar to find your android device.
Once again as the pre-alert to always backup your phone before flashing your phone because the methods and procedures discussed here are considered risky and you should not attempt anything if you don’t know completely what it is. If any damage occurs to your device, we won’t be held liable.
The BoostHD ROM has a known issues where video camera and Wifi hotspot are not working. Before you update Xperia Arc and Xperia Arc S to Android 4.0.4 ICS, please follow the pre-Installation requirements where you need to backup your apps and important data such as bookmarks, contacts, SMS, APNs, and at least you have 50% charge battery. If you finish with the pre-installation requirements, let’s start to install the Android 4.0.4 ICS on Sony Xperia Arc and Xperia Arc S.
The custom ROM promised many improvements and better customization options compare to the official ROM for Xperia Arc and Xperia Arc S but the ROM lack of some features that described on other known issues bug. But if you insist to update Xperia Arc and Xperia Arc S to Android 4.0.4 ICS, let’s follow some instructions from the original page. Visiting the original page also important to know if any update for the BoostHD ROM that most probably comes with new improvements, features, and bug fixed.
The update instructions are not recommended for the common users since it needs many tools including to unlock bootloader Sony Xperia Arc and Xperia Arc S. but hopefully this article useful for anyone who looking for to update Xperia Arc and Xperia Arc S to Android 4.0.4 ICS.