Occasional errors with the emergency call system can occur when reception is impaired. If there is no reception, an error will be reported, but this is not an issue for an update. FEC activation is only required from version 43** onwards, meaning after the update—versions before that do not have the Red Menu lock enabled. Currently, it can be assumed that, for example, version 4397 already includes all planned features, so no significant improvements will follow after that. After an update, it is possible to lose your parameters and have to re-import them; however, I have not personally experienced this, and it is rare. The Audi TSB information specifies NTFS as the required file system. FAT is incorrect and not supported.