of Huawei and ZTE modems are not compatible with WM8650 tablets. Solutions: The solution is very simple, but clear: You must disable the flash drive dongle part. This is most easily done by AT commands : For Huawei modems: Disable: at^u2diag=256 or at^u2diag=0 Enable: at^u2diag=255 For ZTE modems: Disable: AT+ZCDRUN=8 Enable: