For – Android 7.1.1, ColorOS 3.2:
Go to Settings > Software Updates . The phone will automatically check for any available "Over-the-Air" (OTA) updates. oppo a57 2016 firmware
The Oppo A57 (released 2016) is an entry-to-midrange Android smartphone with a MediaTek processor, 3 GB RAM, and a 5.2" HD display. Firmware refers to the complete Android system image (stock ROM) that runs the phone — it includes the OS, recovery, bootloader, device drivers, and carrier or region-specific customizations. This article explains how to identify, download, verify, and safely flash Oppo A57 (2016) firmware, plus troubleshooting and precautions. For – Android 7