Android quiries


1 lets say if I m on kitkat kernal and kitkat rom! Then I wanna revert back to jellybean do I need to flash jb kernal first from recovery then rom ?

2 if I flash Custom kernal and rom some hardware issue arrise obviously I need to be on stock rom and stock kernal and locked bootloader! So I tried finding stock kernal for Xperia L but I failed? How to get stock kernal? Or I don't need it I can fool Sony by installing stock rom only?
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