The Samsung Galaxy SL GT-i9003 is an Android smartphone designed and manufactured by Samsung Electronics that was released in February 2011. It features a 1 GHz ARM Cortex-A8 processor, 4 GB of internal flash memory, a 4-inch 480×800 pixel WVGA Super Clear LCD capacitive touchscreen display, Wi-Fi connectivity, a 5 megapixel camera with a resolution of 2560×1920, and a front-facing 0.3 MP (640×480) VGA camera.
Here is step by step tutorial on how to install Android 4.1.2 JellyBAM custom ROM for Galaxy SL I9003. Before start, please root and install CWM recovery on your Galaxy SL I9003:
Step 1: Download Android 4.1.2 JellyBAM Custom ROM – Link
Step 2: Copy the zip file to your Galaxy SL I9003 SD/Internal card. Then power off your Galaxy SL I9003.
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 SL I9003.