Default [Q] Asus Memopad 10 (me102a) soft brick

Hi there,

How can i fix a soft-brick on my Asus MeMo pad 10 (me102a)
I am on Android 4.2.2 (soft-bricked) with stock recovery.

I have tried to install the stock rom but no success. I get this error after a minute: assert failed (! less_than_int(1381914137, getprop("ro.build.date.utc")) (if I remove the line from the updaterscript it fails because i'm on stock recovery)

Also i tried to install cwm with rkflashtool for my tablet but i get "Cannot open device"

How can i fix the problem with the stock rom?

Kind regards,
Rico