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DLP4500: DLP4500不能连接到电脑

Part Number: DLP4500

之前在论坛上看见回复说可以通过短接J18来解决这个问题,我短接J18 后确实能连上电脑,但当我下载完新固件,移除J18上的跳线帽后,重新上电连接依然显示不能与电脑连接,我是要一直短接J18 不拆除跳线帽吗?