Commonize USM steps

_pages/en_US/include/exploit-usm.txt

@@ -0,0 +1,16 @@
+In this section, you will enter Safe Mode (a feature available on all 3DS family devices) and navigate to a menu where unSAFE_MODE will be triggered, which will launch you into the boot9strap (custom firmware) installer.
+
+1. With your device still powered off, hold the following buttons: (Left Shoulder) + (Right Shoulder) + (D-Pad Up) + (A), and while holding these buttons together, power on your device
+  + Keep holding the buttons until the device boots into Safe Mode (a "system update" menu)
+{%- if include.method == "hbl" %}
+  + If you're unable to get into Safe Mode after multiple attempts, one of your buttons may be failing or broken. If this is the case, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and ask, in English, for help.
+{%- elsif include.method == "bb3" %}
+  + If you're unable to get into Safe Mode after multiple attempts, one of your buttons may be failing or broken. If this is the case, you will need to follow [an alternate branch of BannerBomb3](installing-boot9strap-(fredtool)). For assistance with this matter, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and ask, in English, for help.
+{%- endif %}
+1. Press "OK" to accept the update
+  + There is no update. This is part of the exploit
+1. Press "I accept" to accept the terms and conditions
+1. The update will eventually fail, with the error code `003-1099`. This is intended behaviour
+1. When asked "Would you like to configure Internet settings?", select "Yes"
+1. On the following menu, navigate to `Connection 1` -> `Change Settings` -> `Next Page (right arrow)` -> `Proxy Settings` -> `Detailed Setup` ([image](/images/screenshots/usm/safemode_highlighted.png))
+1. If the exploit was successful, your device will have booted into SafeB9SInstaller

_pages/en_US/installing-boot9strap-(hbl-usm).txt

@@ -56,18 +56,7 @@ In this section, you will use Homebrew Launcher to launch slotTool, which will o
 
 #### Section II - unSAFE_MODE
 
-In this section, you will enter Safe Mode (a feature available on all 3DS family devices) and navigate to a menu where unSAFE_MODE will be triggered, which will launch you into the boot9strap (custom firmware) installer.
+{% include_relative include/exploit-usm.txt method="hbl" %}
-
-1. With your device still powered off, hold the following buttons: (Left Shoulder) + (Right Shoulder) + (D-Pad Up) + (A), and while holding these buttons together, power on your device
-  + Keep holding the buttons until the device boots into Safe Mode (a "system update" menu)
-  + If you're unable to get into Safe Mode after multiple attempts, one of your buttons may be failing or broken. If this is the case, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and ask, in English, for help.
-1. Press "OK" to accept the update
-  + There is no update. This is part of the exploit
-1. Press "I accept" to accept the terms and conditions
-1. The update will eventually fail, with the error code `003-1099`. This is intended behaviour
-1. When asked "Would you like to configure Internet settings?", select "Yes"
-1. On the following menu, navigate to `Connection 1` -> `Change Settings` -> `Next Page (right arrow)` -> `Proxy Settings` -> `Detailed Setup` ([image](/images/screenshots/usm/safemode_highlighted.png))
-1. If the exploit was successful, your device will have booted into SafeB9SInstaller
 
 #### Section III - Installing boot9strap
 

_pages/en_US/installing-boot9strap-(usm).txt

@@ -70,19 +70,7 @@ In this section, you will trigger the BannerBomb3 exploit using the DSiWare Mana
 
 #### Section III - unSAFE_MODE
 
-In this section, you will enter Safe Mode (a feature available on all 3DS family devices) and navigate to a menu where unSAFE_MODE will be triggered, which will launch you into the boot9strap (custom firmware) installer.
+{% include_relative include/exploit-usm.txt method="bb3" %}
-
-1. With your device still powered off, hold the following buttons: (Left Shoulder) + (Right Shoulder) + (D-Pad Up) + (A), and while holding these buttons together, power on your device
-  + Keep holding the buttons until the device boots into Safe Mode (a "system update" menu)
-  + If you're unable to get into Safe Mode after multiple attempts, one of your buttons may be failing or broken. If this is the case, you will need to follow [an alternate branch of BannerBomb3](installing-boot9strap-(fredtool)). For assistance with this matter, join [Nintendo Homebrew on Discord](https://discord.gg/MWxPgEp) and ask, in English, for help.
-1. Press "OK" to accept the update
-  + There is no update. This is part of the exploit
-1. Press "I accept" to accept the terms and conditions
-1. The update will eventually fail, with the error code `003-1099`. This is intended behaviour
-1. When asked "Would you like to configure Internet settings?", select "Yes"
-1. On the following menu, navigate to `Connection 1` -> `Change Settings` -> `Next Page (right arrow)` -> `Proxy Settings` -> `Detailed Setup` ([image](/images/screenshots/usm/safemode_highlighted.png))
-1. If the exploit was successful, your device will have booted into SafeB9SInstaller
-  + If your device instead shows a red screen, you are missing `usm.bin` from the root of your SD card
 
 #### Section IV - Installing boot9strap