Custom ROMs aren't for everyone. Before you proceed:
If you ask on the forums "What is the best ROM for stability?", the answer is almost always Pixel Experience.
If you search "oppo f11 pro custom rom xda best," the highest-rated thread is Pixel Experience Plus. oppo f11 pro custom rom xda best
Since XDA is a forum, threads can get cluttered. Here is how to find the "best" current file:
Inspired by Pixel UI but with monet themes. It has a very active Telegram support group. Custom ROMs aren't for everyone
This is the hardest part. Oppo locks bootloaders tight.
Warning: Unlocking the bootloader requires a "Deep Test" APK from Oppo. You must apply for permission, wait up to 7 days, and accept that your fingerprint sensor may break temporarily on some ROMs. If you ask on the forums "What is the best ROM for stability
Backup your data. This process wipes everything.
LineageOS is the grandfather of custom ROMs. For the F11 Pro, the unofficial build by Rohit is rock solid.
Before you rush to XDA to download a zip file, ensure you have the following prerequisites sorted. This is where most beginners get stuck: