Add warning message about updates for m9

Change-Id: Idc194542619d0e8486452b0980ab111fd94e3f2f
diff --git a/_devices/htconem9.markdown b/_devices/htconem9.markdown
index 52a6ab4..306bab4 100644
--- a/_devices/htconem9.markdown
+++ b/_devices/htconem9.markdown
@@ -11,6 +11,7 @@
 ---

 

 {% include disclaimer.html %}

+NOTE: Installing TWRP can break your ability to receive updates from HTC.

 

 {% include supportstatus.html %}