我的能连开发机，不能下载下列提示：那位给看下，C28xx: GEL Output: Device Calibration not complete, check if device is unlocked and recalibrate.C28xx: GEL Output: Device Calibration not complete, check if device is unlocked and recalibrate.C28xx: Flash Programmer: Device is locked or not connected. Operation cancelled. C28xx: File Loader: Memory write failed: Unknown error

thanks