How to create a self administrator button on the 54xx series phones with 6.0 or higher

I have made this FAQ because right now it is not very well documented how to create the self admin button on a 54xx phone with release 6.0

5.0 and lower had an option for "system phone" and you needed to make a button called "self administer" with value 1 or 2.

With 6.0 the option "system phone" is gone.
There is a replacement option called "user phone level" with options: None, level 1 and level 2
None does nothing
Level 1 and level 2 will do the same as self admin 1 and 2.
With the exception of more options added in 6.0

For the 54xx phones you need to set the level you want but that is not enough.
There is no option in the menu of the phone so you still can not use it.
For the 54xx phones you still need to ad a self admin 2 button.
A self admin 1 does not work.

With the self admin 2 button made you need to set the level you want to use (level 1 or level 2)

Only then you have the admin rights on a 54xx phone.

When you use 7.0 then you need to set "time setting config source" to None!