how can i sell my holdings which are still in il& fs demat account

 i have a holding of sbinifty etf and icicinifty etf ,i bought it on 24 march 2020, in my fyers account, now in my holdings tab it is not showing,i now want to sell it,the executive is saying i now have to transfer my shares from il&fs demat to fyers demat,but i am not able to register in cdsl easiest platform,is there any other way to do it. Tejas Khoday Vanshika Singh 

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