Reversing subdomain activation to subdomain

after activating buddypress on a subdomain, I found it better if I activated it on the root blog, so I will not confuse my members.

I tried to reverse the process, But I completely failed

I tried the following maneuvers but non of them succeeded:

1- I deactivated bp plugin and deleted it --> once installed and activated again it will be activated back on blog 3
2- I droped the bp tables in the database, installed again but the same problem
3- I added this code to wp-config:

define ( 'BP_ROOT_BLOG', 1 );
define( 'BP_AVATAR_UPLOAD_PATH', '/var/www/wp-content/blogs.dir/3/files' );
define( 'BP_AVATAR_URL', 'hxxp://' );

and tried to activate bp plugin again
it activated nicely and asked me to choose a theme for buddypress but once choosing a theme I see only a blank white page and I can't access my dashboard even
I get to it by accessing another blog and deactivating bp plugin to get through my dashboard

so I tried another way

I did all of the mentioned in addition to editing my .htaccess and adding the following codes

RedirectMatch 301 ^/members/(.*)$$1
RedirectMatch 301 ^/groups/(.*)$$1
RedirectMatch 301 ^/blogs/(.*)$$1
RedirectMatch 301 ^/forums/(.*)$$1

but non of them helped

I still have one option to delete blog 3, but I'm sure I will be stuck and No way to do it back

I Know I'm asking too much but Please Help Me