: Set "Rendering Resolution" to 1x or 2x PSP to avoid lag.
: Recent advancements allow the Wii U version of Black Ops 2 to be emulated on high-end Android devices with some success.
If you want a true Black Ops experience on your phone, consider these official options:
: Enable "Auto Frame Skip" if the game stutters.
: Open PPSSPP and create a dedicated "PSP" folder on your Android storage to host game data.
: Switch to Vulkan for better performance on most modern Android devices.
: Download the official PPSSPP - PSP emulator from the Google Play Store.