I tried this once and my calculator exploded
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Last chance to ezmode Mythic Fyrakk was before the raids went all-awakened but even then it was easily possible to wipe even when fighting S3 scaling in S4 gear. When awakened goes away and it goes back to season 3 scaling, the next expansion would have launched so you might be able to do it with 10 to 15 people but you will still have to obey the mechanics or else it wipes the group, the mount drop rate will also be extremely low by that point.
Considering the healing, stacking tank damage, dispels, donât expect to see it soloed until the Legacy buff hits it.
I did this strat with lich king in Wotlk with max levels in Cata dungeon gear. We got destroyed 
I will assume it will be the same case for anyone trying in green- blue gear as diminishing returns would hinder everything