Samsung Galaxy S4 was released in March. It has two variants – Galaxy S4 I9500 and Galaxy S4 I9505. The Galaxy S4 I9500 has a Quad-core 1.6 GHz Cortex-A15 & quad-core 1.2 GHz Cortex-A7 processor, Adreno 320 GPU, 2 GB RAM, 5″ Full HD Super AMOLED screen, 13 MP rear camera, 2 MP front camera, 2600 mAh removable battery and 16/32/64 GB internal storage which is expandable upto 64 GB.
Samsung Galaxy S4 I9500 originally ran on Android 4.2.2. Earlier, Galaxy S4 I9505 got an official Android 4.3 update. This update is also available for the Samsung Galaxy S4 I9500. Samsung might take some time to push out the OTA update. You can install it manually rather than waiting for the update. Follow the instructions given below.