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在将4500固件升级的过程中，升级速度一直0%，将usb线拔掉重新插入后，4500就无法与gui链接了，看论坛说得重新烧写bootloader，请问如何烧写啊？？？？能个教程吗
短接J18.从新上电连接.看GUI是否能够连接上.
否则按照附件JTAG来下载.
