Default [Q] flashtool error at the end ?

has anyone ever gotten this message when using the flashtool to return back to stock ?

FBOOT Complete Time [0s] 1th try
Booting time : 121 sec
FRST status Check....
Factory Reset Flag = 6.
Factory Reset Flag Check Fail!!!
[22:11:35] Factory Reset Flag Check Fail!!!
00000064
Error: [22:11:35] Factory Reset Flag Check Failed

Anyone ?