now you don't have to use flashtools anymore for change your kernel...
follow my instructions:
> Backup your Stock ROM by CWM
> Copy your backed up kernel (boot.img) to your PC. you can see it from sdcard/clockworkmod/backup/*time-stamp of backup number*/here...
> Take my attached .zip
> Open it with Winrar
> Drag n drop boot.img into it (there's a file you can read as "Put boot.img here")
> Close n bring it into your phone
You can do the same thing for CM10's boot.img...
Here you go for example:
> I'm using Stock ROM for now n i wanna flash CM10. I will do;
> Reboot recovery (CWM)
> Backup my current ROM, wipes everything, n flash CM10
> Okay i'm satisfied enough n need to go back to Stock. I will do;
> Reboot recovery (TWRP)
> Backup my current ROM, wipes everything, flash THE STOCK KERNEL you just packed
> Reboot recovery for get into CWM Recovery mode (if can't, just power off n do manually recovery)
> Now i can RESTORE my Stock
> Oohhh... I miss CM10 n need to RESTORE. I will do;
> bla... bla... bla... after wipes everything then flash THE CM10 KERNEL you just packed
> Reboot recovery to get to TWRP mode
> Now i can RESTORE my CM10
is it clear enough...??? feel free to ask me here (do not PM me for this)