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IAR 5.5 仿真出错

用IAR5.5 首次下载提示,固件升级,升级后提示

Thu Jul 17, 2014 18:01:51: Firmware version 30204005 
Thu Jul 17, 2014 18:01:51: Interface dll version 3.2.4.5 
Thu Jul 17, 2014 18:01:55: Unknown device 
Thu Jul 17, 2014 18:01:58: Fatal error: Could not find device (or device not supported) Session aborted!