/data # dd if=/dev/block/mmcblk0p17 bs=1 skip=160 count=10 dd if=/dev/block/mmcblk0p17 bs=1 skip=160 count=10 1.34.707.310+0 records in 10+0 records out 10 bytes (10B) copied, 0.002380 seconds, 4.1KB/s /data # /data # dd if=/dev/block/mmcblk0p7 bs=1 count=8 skip=512 2>/dev/null ; echo dd if=/dev/block/mmcblk0p7 bs=1 count=8 skip=512 2>/dev/null ; echo 11111111 /data # after the change cid command /data # dd if=/dev/block/mmcblk0p7 bs=1 count=8 skip=512 2>/dev/null ; echo dd if=/dev/block/mmcblk0p7 bs=1 count=8 skip=512 2>/dev/null ; echo 11111111 /data #