How to reset admin passwords in BIG-IP 4.5.x !

Hi,

 

can any one tell me how (the process) to recover/reset Admin passwords for web admins if it is lost and root password is known.

 

What are the options we will get if we use "config redundant" in the Active load balances and for standby if "ldap -p adminSecond " is used.

 

 

 

 

Thanks

 

Arijit.