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With respect, I think you are forcing him too quickly; while people can and to form relationships with birds based on force, it will never be the same as one based on trust.
He is completely new in a new situation, totally different than the one he was in before. New people, and no one speaks his language.
I suspect in his past environment he learned that biting was the only thing people understood and so he learned that biting was the only way to get people to leave him alone-- pet stores can often leave a negative impact on parrots, socially, because there are such a huge number of people that don't respect their space. So now he is at your friends house, he's been taught to bite, and one thing that he seems to hate/be afraid of (hands) just got a thousand times scarier because they have gloves on them and don't react as much when he bites them. He's not learning anything other than he has to try and bite harder to get the reaction he wants.
Training can take a long time, and patience is hard (I myself am guilty of this, we all can be!). If he were mine, I'd suggest picking one of two initial training methods: either train to step up onto a branch or object other than your hand first, or acclimate him to hands. Positive reinforcement is the key, and patience.
In either case, your first goal is to find out what his favorite food is (as long as it's not unhealthy... sunflower seeds are okay as a treat, french fries... not so much!).
To train for hands, I'd first approach his cage when he is in a calm mood. Drop in a tiny bit of treat, into the food bowl or whatever, linger for a few moments, then back away. Repeat this several times a day until he seems eager to see you. "That lady brings food! Awesome!". This may take hours, or days (earning trust of a parrot that has been taught not to trust can take a while).
Once he seems happy to see you approach, slowly place your hand into the cage by the food bowl, offer the treat in your hand for a moment. He probably won't come to get it-- this is normal. Then drop it in his dish.
The second time, offer the treat in your hand inside the cage and wait. If he does nothing or runs away, do nothing. If he approaches... even just a little!! A few inches... drop the treat into the dish.
The third time, repeat this. Wait until he starts to get closer, then drop the treat in. You want to train him that coming over to you is fruitful. This may take DAYS.
Eventually the goal is to get him to accept the treat from your hand. If he approaches and bites you before taking the treat, try not to react, withdraw your hand and remove the treat. If he continually approaches, and time after time bites you instead of taking the treat, there is nothing wrong with repeating this training exercise with a glove on. But remember-- you've already taught him that a glove GRABS him and is not to be trusted, so gaining trust with the glove might take some time.
You can then turn this positive reinforcement into a 'step up' command. After he accepts your hands, hold the treat in one hand, and offer your other hand to him, between him and the treat. You may have to do this in stages.... say "step up!" and offer your hand and the treat. If he gets right on, reward him immediately! He might not though. Even if he only puts one foot on your hand, reward him. He may not understand right away what you want him to do. Eventually work up to a strong 'step up' by using treats and hands.
I had an abused cockatiel and it took me 6 months to train her to step up do with with a trusting method. 6 months!! But it can be done, and she is now an extremely sweet bird and has not bit me since.
Were you able to read over the article I linked?
