Theoretically flash kernels with CWM
1.- I noticed that CWM backups generate some files corresponding to each partition.
The important one in this thread is "boot.img" (kernel).
2.- Custom roms ZIP files also have a "boot.img", which is the kernel that is going to be flashed for that rom to work correctly.
3.- I can't unlock my bootloader.
Said that, this is what I thought: Make a CWM backup, replace backup's boot.img with custom rom's boot.img and then make an advanced restore to 'flash' the custom kernel. Finally flash the custom rom normally.
Question: Do I have any risk of hard brick by trying this?
Phone: Sony Xperia U
ROM: Stock 2.3.7
Bootloader: Locked (Not-unlockable)