EN 
ES Oppo A9 2020 Firmware [2025]
Oppo anti-rollback is on many A9 2020 builds. Check ro.boot.antirollback or try to flash an older OTA – if error says “rollback check failed,” you cannot downgrade without advanced hacking (risk: brick).
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Oppo anti-rollback is on many A9 2020 builds. Check ro.boot.antirollback or try to flash an older OTA – if error says “rollback check failed,” you cannot downgrade without advanced hacking (risk: brick).