Have you done FULL WIPE (for me I also wipe all cache data including Dalvik's and battery) Anyway try using latest flasher that's compatible with X8. And furthermore, does ur phone in Flash state (press and hold power button before connect USB cable, only release it when turned GREEN LED) before flashing the kernel.
---------- Post added at 01:00 PM ---------- Previous post was at 12:52 PM ----------
And of coz do FULL WIPE again before u install the ROM (MUST be suited with the designated kernel; not all compatible with different kernel, and vice-versa). It's not necessary to install ROM before flashing the kernel, believe me
sometimes the data might conflict with the kernel and in some cases seems like the phone brick but it isn't (maybe... like in ur case... maybe
)