Move the downloaded firmware package to the root folder of your internal storage.
Yes. The (build A.80) was a legitimate 2021 maintenance release focused on security and stability. However, obtaining it in late 2021 is difficult because OPPO has shifted servers away from legacy devices. oppo f3 update 80 download 2021
From user reports & forum archives (XDA, Oppo Community, Reddit) in 2021: Move the downloaded firmware package to the root
Secure all media, documents, and contacts externally. Custom flashing completely erases internal storage. Reddit) in 2021: Secure all media
Refines processing algorithms for the dual selfie camera setup. Technical Specifications of the Firmware