Save Data in Sqlite onUpgrade

I have a SQLite Database file in assets which I copy to a local Sqlite Database. The SQlite Database file has more than 600 entrys and I do not know which entrys get updated exactly.

When I get the new SQLite file I change the Databaseversion number, delete the local database and copy the new Database into a new local database.

In the SQLite Database are two tables where the user can change things in the local database.

Now I want to upgrade the whole database without loosing the data from the two user tables.

I thought I could read the data from the two tables (into corresponding object lists) , upgrade the database and add the objects again.

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    List[] savedlist = savebeforeUpgrading();
    myContext.deleteDatabase(DATABASE_NAME);

    onCreate(db);        
}

Up to this point everything is working fine. I get a List with my objects. Now there is the problem.

When I try to add the objects back into the new Database inside the onUpgrade method I get either "IllegalStateException: getDatabase called recursively" or "SQLiteReadOnlyDatabaseException: attempt to write a readonly database " when I use the SQLiteDatabase from the onUpgrade method.

How can I get around this problem and save the two tables during the onUpgrade process?