Djm-900 nexus loads into update mode only

Yesterdey I've recieved the brand new djm-900 nexus. Unboxed and turned it on for the first time ever. On the screen I can see only Update ver. 1.30. Please note that I don't press anything while it boots up. As I understood later, this is an update mode. Into this mode i get every time i turn on djm.
I've decidet to update djm. Downloaded latest firmware, and updated via windows computer. I've noticed that update process goes too quick - About 5 seconds, and ends with "success". But after reboot it goes unto update mode again. So I still have the same issue but with new version 1.31.
Please help
Thank You