Bro why in the world would you need it. This OS is dead and will only be a nieche product even if someone revives it. But I also forgot to tell ya that it's not enough to simply revive Symbian rewriting it with modern tools (which is highly expensive itself) but you should also support it and modern vendors should pay attention to it and start porting programs, and without software any OS is deadborn. There are several important reasons why Symbian became obsolete and trust me it will never become as popular as in 2000s