Navigate to XDA Developers. Use this exact search string:
"Android 6" Marshmallow SM-G900F ROM ZIP
Go to Settings > About Phone > Model Number. For the S5, that might be SM-G900F (International) or SM-G900V (Verizon). Do not download a ZIP for a different variant. android 6 download zip file top
Download via Google Drive, AFH (Android File Host), or Mega. These platforms are vetted. Never download from pop-up ads promising "speed boost." Navigate to XDA Developers
Search engines rank for intent. When you search android 6 download zip file top, malicious actors specifically craft pages to trap you. About Phone >
Never download from:
If you use a browser or file manager, make sure it has Storage permission: