How to add new iPad to Apple developer device list with ECID.

My new iPads have only the ECID, but I cannot add them to the Apple developer account's devices list. It is giving me the error "Please enter a valid Device ID".
  1. Is there a way to generate UDID from ECID / Serial Number ?

  2. Is this a bug that apple developer site has ?

  3. What should I do to add these devices so we can deliver these Apps to our clients' iPad (with ECID) ?

Thanks in advance.

How to add new iPad to Apple developer device list with ECID.
 
 
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