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You must have an unlocked bootloader, custom recovery (like TWRP), and a stable computer. How to Install a Custom ROM on Oppo Reno 6 5G
Oppo provides a semi-official “Depth Testing” app that allows users to request bootloader unlocking. Newer versions (ColorOS 12 and 13) break compatibility due to signature conflicts. This means you likely need to downgrade your phone before anything else.