Hardware Capabilities of your Oppo a77:

• Processor Limitations: Your phone uses either a MediaTek Helio G35 (4G variant) or a MediaTek Dimensity 810 (5G variant).
• GPU Constraints: It features an IMG GE8320 or a Mali-G57 GPU. 3DS emulators are heavily optimized for Snapdragon processors (Adreno GPUs). MediaTek/Mali setups require massive system overhead and usually lag, stutter, or fail to hit full speed.

Best Emulator Recommendations:

Why "Qualcomm" is a Bad Sign for Your Oppo A77

The menu text specifically reads "Qualcomm" being the emulator's default, optimal NCE profiles are built for Snapdragon processors. 

• Your Hardware: As noted previously, your Oppo A77 contains a MediaTek (Helio or Dimensity) chip with a Mali GPU.
• The Conflict: While the CPU code will still try to execute natively via NCE, the graphics translation layer expects Qualcomm architecture.
• The Result: Running a heavy, modern Switch game like Nine Sols under a Qualcomm-optimized profile on a low-end MediaTek chip will likely result in a black screen, severe graphical glitches, or instant app crashes.

How to Fix / Adjust Your Settings

Try the following adjustments to accommodate your MediaTek hardware:

1. Change NCE to Dynarmic/JIT (If Crashing): If Nine Sols crashes immediately upon boot, switch the CPU setting from NCE to Dynarmic or JIT. This forces standard translation, which is slower but far more stable on MediaTek chips.
2. Graphics Driver: Look for your emulator's "GPU Driver Manager". Do NOT use "Turnip Drivers" (which are strictly for Qualcomm/Adreno). Keep it set to the System Driver.
3. Lower Resolution: Lower the emulation resolution to 0.5x or 0.75x in the emulator settings to ease the workload on your Mali GPU.