[kiekers]

Something along the line of this will work. Just posting the solution here in case someone is also looking for this. I am unsure about what the parameter for page size is, so you might just want to look that up.

function update_db_users()
{
	 if ( bp_has_members('page_size=1000') ) :
    while ( bp_members() ) : bp_the_member(); 
    
   
 
    $some_field = xprofile_get_field_data( 'some field', bp_get_member_user_id() );
    if ( $some_field != '66' )
        {
	     xprofile_set_field_data( 'Registration Type', bp_get_member_user_id(), 'new value', $is_required = false )   
        }
    
       
         endwhile;
    endif;
}