devkit: Add encouragement to inoculate against flashing failure.

DON'T PANIC

Development_Environment/Boards/imx8.rst

@@ -175,7 +175,9 @@ between the host and the development board.
 Reboot
 ~~~~~~
 
-Flip the boot switch back to eMMC position and press the reboot button. The dev kit serial console should appear at ``/dev/ttyACM0``.
+Flip the boot switch back to eMMC position and press the reboot button. The dev kit serial console should appear at ``/dev/ttyACM0``, confirming a successful reflash.
+
+As usual, don't hesitate to `get in touch`_ if you find yourself stuck.
 
 USB access
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