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ADS1x9x_ECG开发板固件升级问题

Other Parts Discussed in Thread: MSP430F5529

最近刚拿到一块ADS1192ECG的开发板,通过USB连接到PC后打开ADS1x9x ECG-FE GUI软件可以正常工作,但是我用FILE->load firmware升级过几次固件,某次升级后,软件就连接不上开发板了,从设备管理器里也看不到端口了,想要烧回以前的固件也没法了,该怎么办呢,第一次使用MSP430的单片机?