Bought a Lenovo Branded EM7455 and wanted to test it in a Dell E5570.
I’ve tried everything mentioned here and more with no success… maybe this will help someone:
zukota.com/sierra-wireless-em74 … vo-laptop/
- Do not install any drivers
- Download following Driver Pack: mega.nz/#!SYcBRR5S!KLBFTWvQ3cFK … 3LsXGcc3Ng
- in Device Manager find the EM7455 device which Hardware-ID ends with “&MI_03” (its the Modem Device, “MI_03” always corresponds to the AT command COM port)
- Update Driver > Browse my Computer > pick from a list of device drivers etc… > chose x86 or x64 directory and choose “Huawei Incorporated“ then “HUAWEI Mobile Broadband – Modem"
- the Modem started and i could connect with putty on specified COM port !
now you can do the rest from the second post:
6- Open AT Port (with Putty or other program) and excute this commands:
AT!ENTERCND=“A710”
AT!USBPID=9071,9070
AT!USBVID=1199
AT!USBPRODUCT=“EM7455”
AT!PRIID=“9904802”,“001.001”,“Generic-Laptop”
AT!RESET
7- Install Sierra Wireless drivers.
8- Done 