Where to download android for galaxy S5 (G900FZHU1ANE3)? I have problem with my android. Even if I do factory reset. I decide to install another copy of android.

My phone is samsung galaxy S5. Even though finding android for US models is easy (link), my phone model is G900FZHU1ANE3 from Hong Kong and I could not find any android file to download.

Could any one please help he to know where I could download the correct version of android?
The newest available Image ( Android 5.0 ) for your Sm-G900F Samsung Galaxy s5 is available on sammobile. 

Look at the instructions for flashing on this site:

Extract (unzip) the firmware file
Download Odin v3.10.7
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