If your Bose mini 2 cannot be turned on and used, please check in the following order: 1. Please first check if your charger and charging cable are using the original charger and charging cable (many third-party chargers cannot charge properly) 2. Please check the official website for software updates to ensure that your Bluetooth speaker software is the latest version 3. If all the above operations have been completed and the Bluetooth speaker still cannot be turned on, please replace the battery,then you need to force an update to the speaker software, even if it is the latest. (Note: Our battery comes with a circuit board and does not require additional soldering.) You can find installation tutorials on the video website ?If the Bluetooth speaker still cannot be used after following the steps above, it can be determined that the speaker's motherboard is either damaged or locked. It is recommended to contact the after-sales service for repair?