Unity5 Pro - Problem with Lightmaps when compressed for mobile

Hi,

I've baked my lightmaps, and when I switch platform to android or IOS my lightmaps get blotchy and colored wierdly (cf screenshots). It seems to come from the compression as when I set them as truecolor, the problem disappear.

But I can't stay in true color as I've got 17*2048 maps and it's for an augmented reality app so not possible.


I've read on a previous post to maybe untick the DirectX 11 from the pc platform, but it doesn't change anything.

I could really use some help, as I need to upload my project today!

Thanks a lot for the help,

Boris