As per
https://coinmarketcap.com/currencies/firstblood/There's a migration that's about to happen for your 1st token. You just have to follow the instruction and swap it with dawn.
It seems what you need to do can be found there. Read the FAQ article and look at each details of what you have to do.
Thank you for your answer, I was told that the swap already occurred and that the nonswapped coins were burned following the decission of the community. After this, the
https://claim.dawn.org was updated and no longer allows to swap 1ST to DAWN.