Known issues of emteria.OS on Raspberry Pi 4B (RPi4)

Home screen flickers for 10 seconds after wake-up
No support for GSM/WiFi modules, neither USB nor GPIO
Android Notification:
“Serial console enabled
Performance is impacted. To disable, check bootloader”
- It doesn't impact performance and it more of a hint. You can get rid of it by disabling developer messages:
Missing apps and features:
- TWRP (not planned)
Hardware:
- Support for only one simultaneous Bluetooth connection
- Spedal MF920Pro USB Webcam
- Waveshare SKU: 16103, 5″5 touchscreen [forum discussion]

Brightness/contrast is high with official RPi Touchscreen (fixed in v11.8.0)
Newer versions of the official touchscreen do not register touch events (fixed in v11.6.20)
- There seems to be a newer controller revision with "generic ft5x06 (00)"

VNC image is distorted after screen rotation (fixed in v11.5.4)
- Workaround: only start VNC server after rotating the screen
CSI cameras do not work in combination with a DSI display (fixed in v11.4.23)
Display flickers on transitions (fixed in v11.4.23)
Screen Rotation issues (fixed in v11.4.6)
- Rotation is not persistent after reboot
  - Workaround:
    - Connect via adb to the device shell and use following commands:
    - settings put system accelometer_rotation 1
    - settings put system user_rotation X (where X is 0-3, whichever rotation you need)
- 90°/270° rotation switches on screen rotation lock
Problems with Bluetooth LE (fixed in v11.3.16)