1、please try with win7/8/xp pc
2、Please check your file folder name of path if has space symbol or not ,if yes ,please remove
3、Please check if your have select the correct mode,if you don't know which option to select ,please contact with telpo support
4、please reinstall the usb driver 、reboot pc and use new qualcomm upgrade firmware tool
qud.win.1.1_installer_10065.1:https://service.telpo.com:8093/index/user/fetfile?key=r0UbSqwXRGW3idzZ
qpst.win.2.7_installer_00496.2:https://service.telpo.com:8093/index/user/fetfile?key=liZuHATWSNsfjnLK
5、please try with other usb cabes
6、if still not work ,please disable the usb driver signature of your pc firstly ,then reinstall the usb driver,please refer the guide
https://service.telpo.com:8093/index/user/fetfile?key=6BEg9sDOHLSuM50C
Tips:(1)how to comfirm device enter loading firmware mode :make sure device off even when you press power button but still off(2)after reload firmware successful,if device cannot power on ,please select the follow button