Hi, If your Upgrade for U8800 is Version U8800V100R001C00B522G001 To Android 2.3.5, according to the Guidline included in the Download - there is no way back to the Android 2.2
The Upgrade was to include:
a) Missing call issue
b) MMS add attachment issue.
It might pay to ask Huawei if your missing options are the result of the Upgrade. Neil.