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Update odroid-xu4.md

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Documentation/boards/odroid-xu4.md
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@ -12,6 +12,7 @@ The Odroid XU4 has a hidden boot sector that is only visible on the Odroid itsel
2) Clean/wiped/corruped boot sector:
* You'll need to follow [Hardkernel's instructions](https://forum.odroid.com/viewtopic.php?f=53&t=6173) to get a working boot sector. Then flash HassOS and follow instructions above.
* Alternatively, you can try flash HassOS to both an SD and eMMC, then boot off the SD with the eMMC also plugged in, then run `dd if=/dev/mmcblk1 of=/dev/mmcblk0boot0 bs=512 skip=1 seek=0 count=16381` at the Linux prompt. Note that this is untested, but in theory should work..
If you are getting permissions issues when using the dd command, try disabling RO:
`echo 0 > /sys/block/mmcblk0boot0/force_ro`
to re-enable after running dd: