How to edit Devtest without copying/editing anything

YOU CAN'T HAVE ANY OTHER MAP'S IN THE EDITOR FOR THIS METOD TO WORK

This is the easiest way to edit the Devtest map that is locked by default
There's only 1 STEP

Steps:
1: Make an new map the same size as the Devtest (not sure if you have to) and name it Devtes (1 letter short from Devtest)

It should move Devtes to the top and you can edit Devtest

Proof: http://gyazo.com/e62ecc9de3d464ab571c7759e7bdca65

I made a copy because I wanted to have the origional 'Devtest' map untouched. ^^ (Btw, your method isn't working for me D: https://i.imgur.com/Y96rJKN.pngⓘ)

Originally Posted by MinecraftGamer101010

I made a copy because I wanted to have the origional 'Devtest' map untouched. ^^ (Btw, your method isn't working for me D: https://i.imgur.com/Y96rJKN.png)

You can only have the Devtest map for this method to work