Decrease on Texture quality on mobile build (android)

Hi everyone i got an issue when building my game on android device some of my game texture on 3d objects got blured or decrease of quality. even if they are okey on the editor. i got some blurriness on the texture in the scene if i i select the openGL 2.0 in the graphic emulator. When building to android there an option called graphics level where i can select the openGL but there are only those 3 option : automatically openGL 2.0 openGL 3.0 And no one of them are working properly. are there any solution to avoid this bug ? Thanks