I have accidentally deleted my 24E124FFFEF461C8 Gateway and I cannot register it back. It gives an error which says that the gateway already exists. How can I solve this problem.
Can you please read a bit as per below?
https://www.thethingsnetwork.org/forum/search?q=gateway%20already%20exists
This one of those ‘it happens every week’ problems that are well covered on the forum. 2 steps for you
- read the error message carefully - what does it say?
- use forum search and all will be revealed
Clue: Gateway EUI =/= GAteway ID, though latter MAY be derived from former if you let it!..but when re-registering you cant/shouldnt!
Update: for (2) see above! 
from Johan