Itr for dissolution of partnership firm

Please help me on dissolution of partnership firm Firm closed down it's business on August 2016 and also closed bank account in September 2016 . Now firm want to file it's last itr so that firm can be legally shut down . We prepared books of account and realisation account too. Now there is zero balance in any account as all balances were transferred to realize account and then capital account of the partner. Now how to file itr . What steps needed now . Please explain