On both my redmi 3s prime (international Version) and on my redmi 4 prime (both on latest version) there is a bug regarding Bluetooth audio in combination with the xiaomi squere box Bluetooth speaker. When you turn the Volume below 1/4 on your phone, the speaker will play at full Volume. At higher levels the volume controll works fine.. It is extreamly annoying, because it is impossible to listen to music quietly. Other non miui devices like my ipad mini, my nexus 4 or my Windows 10 laptop dont have any problem controlling the voulme of the xiaomi speaker at lower levels.