Strange thing is that in usb network recovery mode i inserted my 2 gb mmc in the internal slot, telneted to 192.168.10.1 and i ran the below commands
/ # insmod /lib/modules/2.6.*/mbcache.ko
/ # insmod /lib/modules/2.6.*/ext2.ko
/ # mount -t ext2 -o noatime /dev/mmcblk0p2 /mnt/new_root

and all executed without errors then i esc back to the boot menu and switched the 2gb with 8 gb mmc and selected to boot from mmc2 in the menu and 8gb mmc booted without failure. then i rebooted the tablet and faced again my nightmare boot failed error. It means that my clone is not corrupted nor wrong but somehow it can not mount....