Samsung Galaxy S3 Mini is powered by the dual-core ST-Ericsson NovaThor U8420 processor clocked at 1 GHz. The processor is backed up by 1 GB of RAM, up to 16 GB of storage, a 4″ WVGA Super AMOLED display, a 5 MP camera, and a 1500 mAh battery.
A custom OmniROM is available for the S3 Mini that will update this device to Android 5.1.1. Additionally, there are a handful of fixes and customisation in the 5.1.1 release, which is still in its beta phase. Follow this guide and update the S3 Mini to the latest Android 5.1.1 update.