Get FreeĀ Samsung Galaxy Alpha G850A Lollipop Update 5.0.2
Instructions
Extract (unzip) the firmware file
Extract Odin ZIP file
Open Odin v3.10.7
Reboot Phone in Download Mode (press and hold Home + Power + Volume Down buttons)
Connect phone and wait until you get a blue sign in Odin
Add the firmware file to AP / PDA
Make sure re-partition is NOT ticked
Click the start button, sit back and wait few minutes.