I find this particulary disconcerting ...
Ethiopian officials asked the French aviation accident investigation bureau BEA, which downloaded data from the black boxes, to permanently delete that information from its servers once it had been transmitted to Ethiopian authorities. The BEA has confirmed complying with the request.
If this a normal procedure, it still seems strange that the data should be deleted by BEA while investigations are still ongoing. Otherwise it would suggest the Ethiopian authorities are trying to conceal something,