How to change lightmap in runtime on mobile

Hello! Guys, can anyone tell me how to switch to pre-baked lighting maps on mobile on runtime? This code works fine in the editor, but when launched on mobile - lightmaps simply do not work.

Code (CSharp):

1.  public Texture2D firstMapDir;
2.     public Texture2D firstMapColor;
3.     public Texture2D secondMapDir;
4.     public Texture2D secondMapColor;
5.  
6.     private LightmapData[] firstLightMaps = new LightmapData[1];
7.     private LightmapData[] secondLightMaps = new LightmapData[1];
8.  
9.     void Start()
10.     {
11.         firstLightMaps[0] = new LightmapData();
12.         firstLightMaps[0].lightmapDir = firstMapDir;
13.         firstLightMaps[0].lightmapColor = firstMapColor;
14.  
15.         secondLightMaps[0] = new LightmapData();
16.         secondLightMaps[0].lightmapDir = secondMapDir;
17.         secondLightMaps[0].lightmapColor = secondMapColor;
18.  
19.     }
20.  
21.     public void SetToFirstLightmap()
22.     {
23.         LightmapSettings.lightmaps = firstLightMaps;
24.     }
25.  
26.     public void SetToSecondLightmap()
27.     {
28.         LightmapSettings.lightmaps = secondLightMaps;
29.     }