[Q] How can I change the framework?

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http://forum.xda-developers.com – I'm interested about change framework on my X8. And I want to make framework myself I don't want to use other people's works. The question how can I do it? First I want to make to Stock rom. I need the programs whatt I can do my own framework. My phone: Xperia X8 Rom: (now) Gingerelite V2 Bootloader: unlocked (HowTos)