Notice Under section 148

Arshad Ali (25 Points)

29 March 2018  
My friend received a notice under section 148 for A.Y. 2011-12 asking to file return in prescribed format within 30 days..

Can anyone, plz, tell me what this prescribed format actually is?

Also guide me to respond to this notice?

should i visit to A.O. before filing return? do I need to hire CA for this now?