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Here’s the official OPPO A57 (CM2 variant) flash file for those needing to unbrick, remove FRP, or fix bootloop issues.

OPPO A57 (CM2) Version: CPH2387 / CPH2371 Firmware type: Stock ROM (Flash File) File format: OFP / OZIP / Extracted Tool needed: SP Flash Tool / OPPO Flash Tool (depending on CPU)