After installing the Koason Android screen, you may encounter problems such as flickering or incorrect display of the BMW or Mercedes original system.

There are also some car models whose original interface seems to display normally, but when returning to the Android interface, there will be afterimages, and the screen will flicker after reversing is completed.

These display abnormalities are caused by the original car display parameters not being selected correctly. You need to go to the Android factory mode to select the correct parameters.

Take a sample for BMW display: 

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

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

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

For EVO system models, select the "Vehicle Display" option with the prefix "EVO"

Routes：SETTINGS-FACTORY (Password: 2018)-Vehicle display

Mercedes Benz screen:

For Mercedes Benz 3.0 system, please select 21/22/23/24.

For Mercedes Benz 3.5 system, please select option 19/20.

For Mercedes-Benz 4.0 system, please select 13/14/15/16/29/30.

For Mercedes Benz 4.5 and 4.7 systems, please select 11/12/13/14/17/18.

For Mercedes-Benz 5.0, 5.1, and 5.2 systems, please select 05/06/07/08/31.

For Mercedes Benz 5.5 system, please select 01/02/03/04/09/10/28.

For Mercedes-Benz 6.0 system, please select 25/26/27/28.

Routes：Settings-Factory (Password: 2018)-Vehicle display