Use this for updating or downgrading using an official OTA package.
This is the factory ROM provided by OPPO. It includes ColorOS and all proprietary drivers.
In India, Jio users sometimes lost voice calls because VoLTE registration failed.
Fix: Modem firmware update in A.09 (December 2022) added carrier-specific VoLTE profiles.
Firmware is the low-level software embedded in your phone’s hardware. It acts as the bridge between the Android operating system and the physical components like the processor, camera sensors, and touchscreen. Firmware OPPO A57s
For the OPPO A57s (model number typically CPH2385), the firmware controls:
Without the correct firmware, your OPPO A57s will not boot. Flashing the wrong firmware can permanently brick your device.
OPPO does not host firmware files on a public, user-friendly server like Google or Samsung. Instead, you have three official channels: Use this for updating or downgrading using an
Once you have successfully installed the firmware, maintaining it is vital for security and performance.
How to enable automatic updates:
Latest Firmware Versions (as of 2025):
If your phone says "Your system is up to date" but you know a newer patch exists in another region, you cannot force a cross-region OTA update. You would need to manually flash that region’s firmware (which may break 4G LTE bands).
The OPPO A57s is a budget-oriented 4G smartphone powered by the MediaTek Helio G35 chipset. Its firmware (stock ROM) is based on ColorOS 12.1 (over Android 12). Maintaining the correct firmware is critical for device stability, security patches, and IMEI/persistent partition integrity.
The safest way to update your OPPO A57s is via the built-in system settings. Without the correct firmware, your OPPO A57s will not boot