The Samsung Galaxy S5 manual is available on Samsung.com. The website provides an option to choose the manual for the particular model of your Galaxy S5 from the drop-down menu provided on the support page. Alternatively, you can enter the model number in the search box provided.
From Samsung.com, click on Owners and Support section of the website. Select Manuals and Downloads from the drop-down list. On the download center page, enter "Galaxy S5" in the search box. A list of Galaxy S5 models are available. Select your model from the list. The manual is available to download in PDF format.