1.Incorrect upgrade will damage your device.
2.Please upgrade your device by cable connection.
3.Do not power off the device when upgrading.
4.This firmware makes 3G150M be compatiable with HUAWEI E303/E3131/E352 and Vodafone K3770.
5.Please unzip the file you downloaded and use the file ended with "bin" or "trx" to upgrade your device.
6.After upgrading, please restore it to factory defaults and configure the device again.