Maybe you tried a port of Android 10 or 11 on your Le Max 2 but found the camera quality degraded (a common issue with custom ports on this device) or the battery life poor. The brings back the original camera algorithms and power management profiles.
The LeEco Le Max 2 (model X820) was once a flagship killer that disrupted the smartphone market with its premium build quality, Snapdragon 820 processor, and innovative (albeit controversial) CDLA audio standard. However, as the manufacturer faced financial difficulties, software support for the device eventually stagnated. Official LeEco Le Max 2 X820 Stock Rom
Custom ROMs sometimes struggle with specific radio bands or carrier aggregation. If you are experiencing dropped calls, inability to connect to 4G LTE, or Wi-Fi instability, the stock ROM contains the specific modem files (NON-HLOS.bin) optimized for the X820 hardware. Flashing the stock ROM often restores network connectivity to factory levels. Maybe you tried a port of Android 10
Here’s a feature proposal:
The Le Max 2 (X820) is powered by the chipset. Official firmware versions are typically based on Android 6.0.1 Marshmallow running LeEco's custom EUI (Emotion User Interface). Model Number: X820 (Global/Chinese variant) Android Version: 6.0.1 Marshmallow UI Version: EUI 5.8 or 5.9 (e.g., 5.8.019S, 5.9.028S) Chipset: Qualcomm MSM8996 Snapdragon 820 Flashing the stock ROM often restores network connectivity