After downloading, check the MD5 checksum. An official OPPO rollback package will have a signature file ( payload.bin with specific headers). If the file is a .exe or asks for a password, delete it immediately.
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Newer OS versions can sometimes be too heavy for the Snapdragon 665 processor . oppo a9 2020 rollback package exclusive
Before we dive into the download, let's be clear: Oppo does not make this easy. There is no "Downgrade" button in settings. To go back, you need an official, signed (usually an .ozip file).
This guide is specifically for the Oppo A9 2020 (CPH1937 / CPH1939). Using firmware from a different model will "brick" your phone. After downloading, check the MD5 checksum
A rollback package, also known as a downgrade package, is a software package that allows users to revert to a previous version of their device's operating system. In the case of the Oppo A9 2020, the rollback package would enable users to downgrade from a newer version of ColorOS to an earlier one.
The phone will boot into Android 10 (ColorOS 7.1). It may be warm; let it settle for 10 minutes. Skip all setup wizards initially to verify performance. This public link is valid for 7 days
Tap on the file. You will be prompted to select the upgrade option.
This is the safest way to get official firmware. OPPO maintains a firmware database.