Use the software that huawei has provided for that device...i recently done the same thing and tried that now my u8800-51 works; my wifi stopped and i was able to fix it by reinstalling the update and switching the time zone to Venezuela Time (-4:30).
Go to http://www.huaweidevice.com/worldwi...&directoryId=3372&treeId=0&tb=1&type=software
then find product by: smartphones....huawei u8800-51