super-skaterhax: add hardware button check

safemode -> HBL-USM
nosafemode -> nimhax

_pages/en_US/homebrew-launcher-(super-skaterhax).txt

@@ -64,8 +64,20 @@ If you haven't already, make sure you have a working Internet connection set up
 1. Select the "GO GO!" button on the top screen
   + If any prompts appear, approve all of them
 1. If the exploit was successful, your device will have booted into the Homebrew Launcher
+1. Power off your device
+
+#### Section III - Hardware Button Check 
+
+{% include_relative include/safemodecheck.txt %}
 
 ___
 
-### Continue to [Installing boot9strap (HBL-USM)](installing-boot9strap-(hbl-usm))
+### Next step: Choose an exploit
+
+If you saw the system update screen in the previous section, Safe Mode is working on your device.
+
+If your device booted into Safe Mode, continue to [Installing boot9strap (HBL-USM)](installing-boot9strap-(hbl-usm))
 {: .notice--primary}
+
+If your device did NOT boot into Safe Mode, continue to [Dumping Movable (nimhax)](dumping-movable-(nimhax))
+{: .notice--info}