When you met this problem, Please check the followings:

1.Is the original CD main unit turned on and working.
2.If the LVDS cable is plugged into Koason android screen correctly.

3.If your car has optic fiber(Ignore if no optic fiber), need to relocate it to android harnes.  Click for details

4.Enter Android factory mode to check if CAN Protocol selection is correct, please select the correct protocol according to the original radio system.
For example, for CCC system, select: CCC, for CIC system, select: CIC, for NBT system, select: NBT, etc.（Note: Generally, this item has been set up when we ship out, but sometimes the loading of the car accidentally clicked on other protocols will lead to abnormalities.）
Routes：SETTINGS-FSCTORY (password: 2018)-CAN Protocol".

5.The EVO has different CAN protocol options, so select the corresponding protocol according to the specific model.

6.If it flickers or does not display the original BMW system correctly, it may be caused by a screen configuration issue. Please do the following checks:

6.1.Enter Android factory mode to set the original car display, please select the car type one by one according to the original radio system, such as CCC, CIC, NBT, EVO, etc., until the original car interface display is normal

For NBT models, select the "Car Display" option with the prefix "NBT" (some 12-year NBT models may need to select the "Car Display" option with the prefix "CIC")

For CIC system models, select the "Car Display" option with the prefix "CIC"

For CCC system models, select the "Car Display" option with the prefix "CCC"

Routes：SETTINGS-FACTORY (Password: 2018)-Car Display

6.2.The EVO system has a specialized selection of parameters.