Thanks for your answer, but i forgot to put this link
https://www.gametracker.com/games/swbf2/forum.php?thread=86800
This is the tuto which i read before posting here. I hope it can help you to understand without difficulties my problem for the "special" gate on death star map

Hey ! I'm french so sorry for bad english :/
First good tuto, but when i trie to change the health of the gate on Death Star maps, i can't find the health in the .lvl
Here are some screenshoots which can help you to understand clearly my problem.
My .lvl in my simple hex editor:


And now my .odf file that i opened in my mod tools folder (because your mediafire download link is dead):


So my problem is that i don't know how to find the health value written in the .odf file, in the .lvl file. SO i can't change it to my new value.
I hope someone can help me =)