You can detect the presence of back blocks from a failed flash operation (such as an Erase) or an invalid Write operation (discovered through an invalid Error Correction Code, or ECC).
如果flash操作（例如Erase）失败，或者Write 操作无效（通过无效的错误校正代码发现，Error Correction Code，ECC），那么说明出现了坏块。
During pairing, red light and blue light flash alternatively. If pairing failed, blue light will flash once per 2 seconds.
配对时，红蓝灯交替闪烁。配对失败后，篮灯每2秒闪烁一次。
During pairing, red light and blue light flash alternatively. If pairing failed, blue light will flash once per 2 seconds.
配对时，红蓝灯交替闪烁。配对失败后，篮灯每2秒闪烁一次。
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