[Q] Segmentation fault when attempting to backup stock partition topic

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I have a kindle fire hd 8.9 8.5.1 rooted with ROOTMASTER. I was able to make fastboot to finally work and now attempting to follow the instructions
http://forum.xda-developers.com/show....php?t=2128175
in order to install 2nd-bootloader + TWRP 2.7.0.0 and thereafter go to cyanogenmod

However, my very first comand fails
adb shell su -c "dd if=/dev/block/mmcblk0boot0 of=/sdcard/boot0block.img"
generates "Segmentation fault" error message.

Is there something wrong with my root or what's going on?
Thanks!

xda-developers


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