联想b50进去bios设置usb网!
string(230) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%81%94%E6%83%B3b50%E8%BF%9B%E5%8E%BBbios%E8%AE%BE%E7%BD%AEusb => Failed to connect to 14.18.117.71 port 38093: Connection refused"
联想b50进去bios设置usb网!