@vitalianoneto I would troubleshoot with CS by emailing support@littleBits.cc if you can't connect to the official app. They can help out.
If you are using android and having app trouble, try enabling location services/GPS - some phones require that to be on to use the necessary sensors in the phone.
As of right now, I don't think it's possible to connect the BLE with a private app. But, hack away if you'd like to (although, it will likely void your warranty).