Tang Nano无法下载embFlash

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Info: “embFlash Erase,Program” starting on device-1…
Info: Status Code: 0x00019020
Error: Finished, NOT wakes up
Info: User Code: 0x00000000
Info: Finished!
Info: Cost 4.97 second(s)
:

重新上电没任何反应
sram下载是能跑的

断电重试几次下载看看?