add badupdate guide for launching XeLL

Author: InvoxiPlayGames

docs/Hacks/Bad_Update_Hack.md

@@ -0,0 +1,65 @@
+# Bad Update Hack
+
+In Feburary 2025, Grimdoomer released the [Xbox360BadUpdate](https://github.com/Grimdoomer/Xbox360BadUpdate)
+hypervisor exploit, which allows for running unsigned code on any Xbox 360
+model on the 17559 dashboard version - the latest as of 1st October 2025,
+released on 12th November 2019 - using entirely software-based entrypoints.
+
+Several save game exploits can be used to launch the Bad Update exploit:
+
+* **Tony Hawk's American Wasteland** via Tony Hawk's Pro Strcpy.
+
+* **Rock Band Blitz** via DaTArrest.
+
+* **Xbox 360 Dashboard** via ABadAvatar - the guide will be using this exploit.
+
+This guide will show you how to launch XeLL Reloaded and other LibXenon homebrew.
+
+## What you need
+
+* An Xbox 360 running dashboard 2.0.17559.0.
+
+* A FAT32 formatted USB drive.
+
+* The latest version of [ABadAvatar](https://github.com/shutterbug2000/ABadAvatar/releases).
+
+* The latest version of [FreeMyXe](https://github.com/FreeMyXe/FreeMyXe/releases).
+
+## Preparation steps
+
+1. Ensure your console is on dashboard version 2.0.17559.0.
+   ![](images/BU-DashVersion.png)
+
+2. If enabled, disable automatic profile sign-in for your profile.
+   ![](images/BU-ProfileSignIn.png)
+
+3. Disconnect from Wi-Fi on your console, or unplug the Ethernet cable.
+
+## Copying files
+
+1. Extract the contents of the ABadAvatar ZIP file to the root of your USB
+   drive. There should be a "BadUpdatePayload" folder and a "Content" folder.
+
+2. Extract the contents of the FreeMyXe ZIP file to the BadUpdatePayload folder
+   on your USB drive.
+
+3. Delete any existing "default.xex" in the BadUpdatePayload folder, and rename
+   "FreeMyXe.xex" to "default.xex".
+
+## Running the exploit
+
+1. Turn off your console, then plug in your USB and turn it on again.
+
+2. At the dashboard, you should see a notice from ABadAvatar and the exploit
+   will start running.
+   ![](images/BU-ABadAvatar.png)
+
+3. Within 2 minutes, your Xbox should show you a prompt from FreeMyXe. If you
+   don't get a prompt or your console freezes, power off the console and try
+   again.
+   ![](images/BU-FreeMyXe.png)
+
+4. Select "Launch XeLL instead" and XeLL Reloaded will launch.
+   ![](images/BU-XeLL.png)
+
+5. It is safe to re-connect an Ethernet cable once XeLL has launched.

docs/Hacks/images/BU-ABadAvatar.png

@@ -52,6 +52,7 @@ nav:
       - Frequently Asked Questions: 'Support/FAQ.md'
       - Links: 'Support/Links.md'
     - Hacks:
+      - Bad Update Hack: 'Hacks/Bad_Update_Hack.md'
       - Reset Glitch Hack (RGH): 'Hacks/Reset_Glitch_Hack.md'
       - SMC Hack (JTAG): 'Hacks/SMC_Hack.md'
       - King Kong Hack: 'Hacks/King_Kong_Hack.md'