I am not a professional player, so there may be some cognitive mistakes in the concept or process.
What is mentioned below is for Japanese edition. Xperia Tablet Z (model) SO-03E In terms of specific details, there must be a difference between the different models.
All the tools mentioned in this article are suggested to go to the official website. However, in order to facilitate some people without ladder, I made a diversion of Baidu cloud. It can satisfy me now. 4.1.2 Upgrade to 5.1.1 The demand is not known. Portal Password: h6nn)