You can edit/create bootmenu.conf (not .sh) and add Code: dmesg >/tmp/dmesg.out as a last line and after boot
dmesg >/tmp/dmesg.out
dd bs=1M if=/dev/mmcblk0p2 | gzip > /media/mmc1/images/IT2006_2.2_Working.gz
gzip -dc /media/mmc1/images/IT2006_2.2_Working.gz | dd of=/dev/mmcblk0p2 obs=1M