The brand name of the new phone is 'Vivo X5 Max Prime' by vivo.
We can also guess that this '乐' might refer to the audio performance that vivo is known for, which we've always been proud of.
"Vivo X5 Max Prime"应该是正确的拼写。"Prime"是音译单词，代表"高端"或"顶级"的意思，而不是"顶级"，所以正确的是：
The brand name of the new phone is 'Vivo X5 Max Prime' by vivo.
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