download this and copy it to flashtool/firmware folder http://forum.xda-developers.com/atta...0&d=1332708154

then dont connect your phone
1)run flashtool
2)click flash and select the alfs kernel
3) select kernel.sin
4) and flash it will show the instructions
5) now hold the back button it will show green LED thn it will flash without any problem

16/052/2012 07:52:06 - INFO - <- This level is successfully initialized
16/052/2012 07:52:06 - INFO - Flashtool Version 0.6.8.0 built on 2012-02-26 19:26:25
16/052/2012 07:52:06 - INFO - You can drag and drop ftf files here to start flashing them
16/052/2012 07:52:12 - INFO - Device disconnected
16/052/2012 07:52:14 - INFO - Selected X8_08-cm7-v5_Alfs&Djnilse.ftf
16/052/2012 07:52:14 - INFO - Preparing files for flashing
16/052/2012 07:52:14 - INFO - Please connect your device into flashmode.
16/052/2012 07:52:21 - INFO - Device connected in flash mode
16/052/2012 07:52:21 - INFO - Opening device for R/W
16/052/2012 07:52:21 - INFO - Reading device information
16/052/2012 07:52:21 - INFO - Phone ready for flashmode operations.
16/052/2012 07:52:21 - INFO - Start Flashing
16/052/2012 07:52:21 - INFO - Flashing loader
16/052/2012 07:52:23 - INFO - Loader version : r4A060 / Bootloader status : ROOTED
16/052/2012 07:52:23 - INFO - Flashing kernel.sin
16/052/2012 07:52:25 - ERROR - ERR_SEVERITY="MAJOR";ERR_CLASS="MEMORY_CLASS";ERR_ STATIC="HASH_VER";ERR_DYNAMIC="Failed to init erase";
16/052/2012 07:52:25 - ERROR - Error flashing. Aborted
16/052/2012 07:52:25 - INFO - Device connected in flash mode
16/052/2012 07:52:27 - INFO - Device disconnected


I tried




22/005/2012 10:05:54 - INFO - Selected X8_danibosev_stock kernel.ftf
22/005/2012 10:05:54 - INFO - Preparing files for flashing
22/005/2012 10:05:54 - INFO - Please connect your device into flashmode.
22/006/2012 10:06:17 - INFO - Device connected in flash mode
22/006/2012 10:06:17 - INFO - Opening device for R/W
22/006/2012 10:06:17 - INFO - Reading device information
22/006/2012 10:06:17 - INFO - Phone ready for flashmode operations.
22/006/2012 10:06:17 - INFO - Start Flashing
22/006/2012 10:06:17 - INFO - Flashing loader
22/006/2012 10:06:18 - INFO - Loader version : R4A045 / Bootloader status : ROOTED
22/006/2012 10:06:18 - INFO - Flashing kernel.sin
22/006/2012 10:06:22 - INFO - Flashing finished.
22/006/2012 10:06:22 - INFO - Please wait. Phone will reboot
22/006/2012 10:06:22 - INFO - For flashtool, Unknown Sources and Debugging must be checked in phone settings
22/006/2012 10:06:22 - INFO - Device connected in flash mode
22/006/2012 10:06:24 - INFO - Device disconnected

and behold a glimpse of another kernel

Automatic translation (English):
I burn the movie what happens on the desktop can then invent something?

Original text (Polish):
moge nagrać film co sie dzieje na pulpicie może wtedy coś wymyślicie??

I also had this problem....
until now.... there is still no solution...