Thee is a bug on older software versions where if you change the aar analysis tables and put in the range of extensions you want to wipe it will wipe them.
For instance, if you had 1000 phones using 2xxx range. Put 2xxx in the aar tables and enter, then remove it again and you'll find that all 1000 phones are gone!!!!
SCARY!!!
[Started on Version 3 software 15 years a go]