手欠点了wifi升级，然后进了recovery mode
吓一跳，连上usb，重新刷了一遍固件ok了

http://download.ebz.epson.net/dsc/du/02/DriverDownloadInfo.do?LG2=ZH&CN2=CN&CT
I=63&PRN=ET-2750%20Series&OSC=WS
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FROM 120.229.14.*