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DLPC900: dlpc900控制板上重新焊接了新的FLASH,LED灯不亮,不能用USB下载固件, 是不是要先用JTAG Flash Programmer 下载bootloader?

Part Number: DLPC900

dlpc900控制板上重新焊接了新的FLASH,LED灯不亮,不能用USB下载固件, 是不是必需用JTAG Flash Programmer 下载bootloader才行?