刷机phone时出现的状况，请大家帮忙看下，到了这里就停止不动了，试了好几次都是这样。无法再继续刷了。
用的Qingdao Downloader V0.4
** Wait for Connect Request from Mobile...
** (POWER ON the PHONE!)
** Send '0x44' to SWIFT Chip
** Connection granted from SWIFT Chip
** Received 16 bytes from SWIFT chip
** Sending the customer ID and the same 16 bytes to SWIFT chip... OK!
** Try to change Timeout !
** Ok! Timout Changed(1600 mSecond)
** Setting downloading address (SCRAM: 0x0C000000)... OK!
** Downloading the pre-Loader (1860 bytes)... OK!
** Set the start address of pre-Loader (SCRAM:0x0C000000)... OK!
Start Pre-Loader... OK!
Trying to change the baudrate...
Change Baudrate 115200 -> 921600... OK!
Downloading the Boot-Loader (318508 bytes)... checksum mismatched from Pre-Loader (0x0)
谢谢大家的智慧~！
用的Qingdao Downloader V0.4
** Wait for Connect Request from Mobile...
** (POWER ON the PHONE!)
** Send '0x44' to SWIFT Chip
** Connection granted from SWIFT Chip
** Received 16 bytes from SWIFT chip
** Sending the customer ID and the same 16 bytes to SWIFT chip... OK!
** Try to change Timeout !
** Ok! Timout Changed(1600 mSecond)
** Setting downloading address (SCRAM: 0x0C000000)... OK!
** Downloading the pre-Loader (1860 bytes)... OK!
** Set the start address of pre-Loader (SCRAM:0x0C000000)... OK!
Start Pre-Loader... OK!
Trying to change the baudrate...
Change Baudrate 115200 -> 921600... OK!
Downloading the Boot-Loader (318508 bytes)... checksum mismatched from Pre-Loader (0x0)
谢谢大家的智慧~！