You cannot!!! You can only go back as far as 4.4.4 android system
Download the Galaxy S5 firmware for your particular model onto your PC. ...
Download Samsung drivers on your PC (if you don't already have them installed).
Download Odin v3.09 (on your PC).
Charge your Galaxy S5 battery to 80%.
Enable USB Debugging in Settings > Developer Options.
For further steps refer to Samsung Galaxy S5 Manual. https://guideusermanual.com/product-name-galaxy-s5-manual&po=356337&lang=English
This link will help you with your problem: http://forums.androidcentral.com/samsung-galaxy-s5/489071-tutorial-downgrade-samsung-galaxy-s5-5-0-4-4-kitkat.html
SOURCE: WHEN IS LOLLIPOP 5.0 GOING TO BE RELEASED TO SAMSUNG GS5 IN AUSTRALIA PLEASE.
The rolling out of the update will be done in waves, which will take around three weeks to reach every customer
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