Adding safecerthax link for failed SSLoth-Browser troubleshooting

Author: ajl721

docs/installing-boot9strap-(ssloth-browser).md

@@ -78,6 +78,7 @@ In this section, you will visit the browser exploit webpage, which will use univ
 1. Tap the "PROCEED TO HAXX" button
 1. If the exploit was successful, you will have booted into SafeB9SInstaller
     + If you get an error, [follow this troubleshooting guide](troubleshooting-ssloth-browser)
+    + If troubleshooting fails and your console has **only** 2 working shoulder buttons, follow **only Section IV** of [safecerthax](installing-boot9strap-(safecerthax).html#section-iv-safecerthax)
 
 ### Section IV - Installing boot9strap