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These leaked files are often "signed" with test keys. If your OPPO A57 has an anti-rollback feature enabled, using an older Firehose file may fail or permanently brick the device.
Since the Oppo A57 is powered by a Qualcomm Snapdragon chipset, the Firehose file is the "key" required to unlock the device's bootloader or flash a dead phone back to life. Key Features and Uses oppo a57 firehose file
If you are a security researcher or repairing your own device with consent: These leaked files are often "signed" with test keys
The OPPO A57 was released in two primary variants, and identifying which one you have is the most critical step before proceeding: oppo a57 firehose file