Unregister will is valied?

The procedure must be on website and in O/o Authority and requisite forms containing complete process and procedure, can be obtained from O/o Authority.  

The O/o Authority may ask to submit NOC from all legal heirs and/or release advt in newspapers inviting objections, if any OR write by itself to legal heirs inviting to submit objections, if any, in fixed time.

If NO objection is received in fixed time, O/o Authority may transfer property in the name of beneficiary.  

If objection is raised O/o Authority may ask for Probate of the WILL.

 

Similar query is discussed at:

https://www.lawyersclubindia.com/forum/details.asp?mod_id=150424&offset=3

You may pick up relevant points.

Your query on legal heir has alrady been addressed at:

https://www.lawyersclubindia.com/forum/Legal-heir-certificate--150454.asp

Instead of asking your friends here and there prefer to consult a very able local senior counsel of unshakable repute and integrity specializing in revenue/succession/civil matters.