Hello Ali2006,
we have tested tremendous amount of usb flash drives few weeks ago and all those changes in code are going to be reflected in new upcoming MQX 4.0, which is planning to be released next month. This should solve most of the problems if not all :smileyblush:
I am not aware of any update for 3.8 but you can diff changes with 4.0.
Regards,
MartinK