The official of Android 4.1.2 firmware not yet available for Samsung Galaxy S3. Samsung Android Team now is work hard and hope that Galaxy S3 will get the firmware as soon as possible.Although the Android 4.1.2 leaked firmware is now available download, but I think that almost all Galaxy S3 users not take risks to try on this leaked firmware. This firmware may consist lot of bugs and not suitable for daily use. So far, only the new releases of Android devices such as LG Nexus 4, Nexus 10 and some of Android flagship Nexus phones get this Android 4.1.2 firmware.
Last few week, Google has released the Android 4.1.2 SDK for developers. So, some of experienced Android developers start cook this Android 4.1.2 ROM. Here , Android 4.1.2 custom ROM- Jelly BAM is now available download and can proper run into your Galaxy S3. Thanks to the XDA developer senior member – iGio90, this custom was integrate with lot of features for Galaxy S3 such as Bravia XLoud audio libraries, Sony Walkman music player, Bravia Engine libraries, Beats Audio by Dr Dre, and Tons of customizations. Here is the step by step how to install:
Before Start, Make sure your Galaxy S3 has been root. You can refer here on how to root and install CWM recovery into Galaxy S3.
Step 1: Download the ROM – Link
Step 2: Copy the zip file to your Galaxy S3 SD/Internal card. Then power off your Galaxy s3.
Step 3: Enter recovery mode by press Volume Up+ Home + Power Button.
Step 4: Now you are in recovery, then enter the Mode Wipe data/cache to wipe all data.
Step 5: Now you can start Flash the zip into your Galaxy s3 .