Boba Fett

Boba can only ignore Taunt while BH Resolve buff is on him. If he has died once and lost the buff, he can no longer ignore Taunt. 

Darth Nihilus Annihilate prevents revive, and Boba Ability does not circumvent that. Can’t be dispelled or prevented only refers to the BH Resolve buff, and does not mean that the revive cannot be prevented. 

If you actually read the wording in the abilities text. It is referring to the fact that bounty hunters resolve can't be dispelled or prevented. Says nothing about the revive affect. Which Devs have stated since nihilus release he (Boba) can't be revived. It's the same reason why he doesn't revive when Rancor Eats him.

You only show your ignorance by the fact that it has been addressed by Devs ages ago and it was intentionally setup that way. You just can't grasp that reality so you choose to belittle and degrade other people whom have probably been playing longer and are far more knowledgeable about the game than you, and only wish to offer some help to your request. But that's your call. I guarantee that the way BHR works against Nihilus and Rancor, or even Death Trooper when he deathmarks Boba is the way it is supposed to. Choose to say otherwise but it is what it is.

As to your other point on BHR, there are some toons whose Taunt also states they can't be ignored so there for it would negate BHR ignoring it depending on the RNG rolled during that turn. I too have experienced that not only with Boba but with Commander Luke aswell. RNG is the true decider on how the turn is played out. Ive had matches where Raid Hans Shoots first ability is done second to strangely a really fast opponents toon. They get their turn off first do to RNG.

1) I obviously read your post. And replied to my great regret.

2) You have provided no Screenshot or Video, how would I know if your Boba had lost his buff at that point in time? I can only offer what is the most plausible explanation and see if that was the cause.

3) BHR only grants revives unless there is an effect preventing it i.e. Annihilate. The effect you are looking for is only on Nightsister Zombie which specifically states:This revive cannot be prevented.

4) The wording is very clear, only buffs can be either Dispelled/Prevented. How do you DISPEL THE REVIVE EFFECT??? 

Many ability descriptions are not sufficiently clear and/or inconsistent with other characters ability descriptions. I used to take out Boba with Deathtrrooper. Deathmark description says "cant be revived". During the past couple of months both happened: Boba revived (himself) and did not come back. I submitted a bug and asked for clarification but there was no answer. Another bug related to Deathmark was probably solved but in this case CG did not comment on the intended behaviour as well.

To OP: people here are trying to help, please keep calm and do not insult other people.