Rani wrote:I' m considering to ship back to VKB the item for a replacement
Shipping anything back without previous agreement is waste of time and funds, as the parcel will be automatically returned to sender.
Whatever replacements or fixings can only be made after talking to the shop where you had bought the device, and going through proper diagnostic procedures.
So, your
first step should be:
contact the dealer and get a support ticket. Chances are, the shop will be able to help you right away.
Second step,
only if the shop failed to help, or if you bought your device from VKB directly: read this post
http://forum.vkb-sim.pro/viewtopic.php?f=25&t=2762, and follow the directions point by point with no omissions or shortcuts.