Hi,I have a Huawei umg1831 modem. I had updated my modem with wrong firmware,as a result the IMEI no. from my modem is removed. Now no network providers are registering my modem with their network.So if any one knows how to rewrite IMEI no. on huawei UMG1831 modem using AT commands or by any other way, then plz replyThanks