An FIR can only be filed for a cognisable crime.
In the event someone is trying to file an FIR for a crime that falls in the non-cognisable category it is the duty of the police to listen to them, enter the matter in their daily register or dairy, give the person a signed copy of the entry made (as proof of the matter being recorded) and direct them to the closest or appropriate magistrate.
The signed copy of the entry made by the police is free of cost and is a right to receive.
F.I.R. means First Information Report, made to police, about commission of a cognizable offence, In effect, it amounts to putting law in to motion by giving information relating to the commission of a cognizable offence to an officer in charge of a police station, (which shall be reduced into writing and read over to the informant) and shall be signed by the person giving such information. It is mandatory to give a copy of the first information report (as recorded by police) to the complainant or informant free of cost.
Any person who is victim of an offence or who is a witness to any such offence or who has knowledge about the commission of any such offence can lodge an F.I.R.