I think I may have something to help… @William.lau
Check on your device and see if both of your flare 2s show as connected to your device. Perhaps one is connected to another device… should only have one connected to your main device, and the other connected to nothing when you start out.
If so, that would explain why they flash same color. They may both be paired with a device.
If you find they are both connected, I’d then offer, to forget one of the on your device, turn off that speaker, at this point you should have just the one connected and the BT icon should be solid blue.
Turn back on the second flare 2, and press and hold the BT button until it flashes white, then release. Then press and hold the Bluetooth button on the first speaker so it flashes white and then release.
They should see each other, and only one to your device, and should work as intended (and through the app now).
I ran into this when I mistakenly connected a single flare 2 to my iPad, when I hadn’t realized it wasn’t the same one as the last I did.
I have since noticed that my original one doesn’t have a mark on the top, like the other two, so I now can do this easy.
If it helps, I can make a quick video for you to reference.
Hope it works, please let me know