Oppo Reno 2 custom ROM scene is notoriously difficult compared to brands like Google or Xiaomi because Oppo strictly locks its bootloaders and rarely provides official unlock tools.
There are several reasons why you might want to install a custom ROM on your Oppo Reno 2:
Magisk with liboemcrypto disabler for Widevine L1 retention.There is no widespread official support from major projects like Evolution X
Custom Options: Current development on forums like XDA Developers has enabled newer Android versions, though availability depends heavily on your specific sub-model (Reno 2 vs. Reno 2F/2Z).
Here is the full content regarding custom ROMs for the Oppo Reno 2 (model number: CPH1907 / CPH1919).