[Fragenstein]

Here's what I've tried. Edited admins.cfg. Edited admins_simple.ini. In server console sm_reloadadmins.
Still getting you don't have permission to access admin menu (in game).

admins.cfg:

/**
 * USE THIS SECTION TO DECLARE DETAILED ADMIN PROPERTIES.
 *
 * Each admin should have its own "Admin" section, followed by a name.
 * The name does not have to be unique.
 *
 * Available properties: (Anything else is filtered as custom)
 *      "auth"          - REQUIRED - Auth method to use.  Built-in methods are:
 *                        "steam"  - Steam based authentication
 *                        "name"   - Name based authentication
 *                        "ip"	- IP based authentication
 *                        Anything else is treated as custom.
 *					 Note: Only one auth method is allowed per entry.
 *
 *      "identity"      - REQUIRED - Identification string, for example, a steamid or name.
 *					 Note: Only one identity is allowed per entry.
 *
 *      "password"      - Optional password to require.
 *      "group"         - Adds one group to the user's group table.
 *      "flags"         - Adds one or more flags to the user's permissions.
 *		"immunity"		- Sets the user's immunity level (0 = no immunity).
 *						  Immunity can be any value.  Admins with higher 
 *						  values cannot be targetted.  See sm_immunity_mode 
 *						  to tweak the rules.  Default value is 0.
 *
 Admins
	"Fragenstein"
	{
		"auth"		 "steam"
		"identity"	      "STEAM_76561197968912756
		"flags"		 "z"
	}

admins_simple.ini

"STEAM_76561197968912756"	"99:z"				//generic, kick, unban for this steam ID, no immunity
"!127.0.0.1"		        "99:z"				//all permissions for this ip, immunity value is 99