Installing a custom ROM on the is significantly more challenging than on many other Android devices. While theoretically possible, there is virtually no developer support for specific builds like LineageOS or Pixel Experience for this model. The Core Challenges Locked Bootloader
If you still want to proceed, visit the for the OPPO A11K (CPH2083) . Search for threads by developers like Sarthak Roy or Dyneteve . Do not download ROMs from random YouTube videos—they often contain malware. oppo a11k custom rom