Hi Wu,
Yes, none of KE0x and KEA series devices has ROM bootloader, flashloader, and flash-resident bootloader. If customer want to use flash bootloader, they have to port it by themselves. I'm not sure why. I guess this is because many of KE/KEA usage is auto and high reliable control. Bootloader 2.0.0 isn't fit for such case. But yes, in many other application, bootloader is useful. But it seems there isn't such a plan.
Regards,
Jing