hi use these tools to do what you want.semc tool usbsmart v8.4 cracked or setool2 lite v1.11.search setool lite v1.11 and after download it open it and choose k610.k618. press identify and after 3 sec. stop it and choose w810 "recovery" tabb is displayed and do not be late press recovery and wait to finish then full flash it.read gdfs in bin format before you do anything.