Android texture formats on GLES2 devices

Hello.
I am bit confused about texture formats i can use on old(gles2) android devices.
I have sprites with alpha and format setted to "automatic compressed".

By default its setted to ETC2. So on old devices unity unpacking all textures on start. Its very slow and takes a lot of RAM.
If i set Texture Override to ETC in build settings- its still ETC2. According to the docs it should be RGBA16. I posted a bug about it(case 813678), but now its not working.
I can set Texture Override to ETC and set "split etc1 with alpha" but its not working with UIImage. Its known bug but still not fixed in 5.4.0b25.

I can set format for my texture to RGBA16 manualy, but there are hundreds of textures in project and i have to change each to RGBA16 for build gles2 and then to etc again to build gles3.

Did i missed something? How can i change textures format to something supported gles2?

 

Are your textures power of 2 ?
ETC may ask for textures that are power of 2

 

Yes, my texture power of 2. Its also can be reproduces with SpritePacker atlases.

 

This is what it looks like on my side. But I'm not using the alpha option. I use a duplicated texture with Alpha 8 mode

 

Your texture does not contains alpha. Or you just seted format to ETC1 in advanced settings.
http://prntscr.com/bsdn3w

 

That is what I've done, I know. This was to compare with your own image.
And Unity select automatically ETC2 when you are using default compression.
In the build screen, the format you choose, is the format that will be used during compilation, it is not the format the editor will use. You have to change to ETC1 explicitly for each texture.

 

This option changes format not only for editor. I checked it. I cant set pvr and i see pvrtc in preview window in editor. I can set etc1 and it will be etc2 on the device. Thats what confusing me. I have to change all textures format for each one.
I still think that setting override to ETC1 should get us rgba4444 format for transparent textures.