help with RockChip reader anyone?

[nagash]

Hello!
I bought a RockChip reader (version 1.1.1 touch) before a week.
From the first time using it,since now,it shuts down after 3 minutes (although I didn't select that option) and after that all my data are lost!
The weird thing is that all settings are lost too,except the date and time..
I tried to contact the seller,and the only thing he could tell me in english was to format it-which I tried,with no luck several times,unless I do it wrong!

Can someone tell me what can I do,or if there's a possibility to change firmware to make it work? (and how that can be done?)

Thanks in advance!