بسم الله الرحمن الرحيم
(Fatwa: 1594/1176/H=11/1434)
Talaq mughallazah took place. Now the husband neither has right to take her back nor he has right to do new nikah with her without a Shariah halalah. Now you can marry anywhere except of the abovementioned husband. If the second husband gives you talaq after intercourse or dies after it and in each case the iddah is over then you will have the right for your new nikah. Then if you wish you may marry your husband mentioned in the question. There is no other way for the first husband to be halal for you except this. It has been mentioned in Bukhari Sharif Vol. 2, p 791, Fatawa Hindiyah, Vol. 1, p 501 etc.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband