Unofficial TWRP for Oppo A91 (CPH2021) and Oppo F15 (CPH2001) running Android 11.
⚠️Recovery does not work on the PCPM00 model.

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Installation

Since this phone has fastboot disabled it is necessary to use alternative tools. I recommend using MTKClient.
Just download the latest recovery from Releases and flash the recovery.bin file to recovery partition.

⚠️ After flashing, when device is set to boot to recovery mode, it might show a dm-verity error.
For fix press the power button once to continue booting otherwise device will shut down.

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How to build

Use the minimal manifest twrp aosp 11 here
Clone this repository as it is the device tree under [location of your manifest]\device\OPPO\OP4B9B and use these commands:

source build/envsetup.sh
export ALLOW_MISSING_DEPENDENCIES=true
lunch twrp_OP4B9B-eng
export TW_DEVICE_VERSION
mka -j$(nproc --all) recoveryimage