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-# L1
+# Widevine L1 – Extracting Keybox from eMMC Dump (MSTAR Devices)
+
+This guide explains how to identify and extract a **Widevine L1 keybox** from an **eMMC dump**, commonly found on **MSTAR-based TVs and set-top boxes**.
+
+---
+
+## 📦 What You Need
+
+- An **eMMC dump** (usually the largest file)
+- **Windows / Linux / macOS**
+- Hex editor or CLI tools:
+  - `strings`
+  - `grep`
+  - `xxd`
+- **Provisioning script** (can be used with VT)
+- Basic understanding of **DRM / Widevine flows**
+
+---
+
+## 2️⃣ Identifying the Correct eMMC Dump
+
+### ✔ File Size
+
+- Usually **4–8 GB**
+- Sometimes **15 GB+** (TV models)
+
+➡️ **Always pick the largest dump file**
+
+---
+
+### ✔ Detecting MSTAR Devices
+
+Open the dump and check the beginning.
+
+If it starts with: MBOOT
+
+➡️ The device is using an **MSTAR SoC**  
+(common for TVs and set-top boxes)
+
+---
+
+## 3️⃣ Locating the Widevine Keybox
+
+### ❌ What Is NOT the Keybox
+
+Ignore files or blocks like:
+
+- `bgroupcert.dat`
+- `zgpriv.dat`
+- Dumps containing **many** `MSTAR_SECURE` blocks
+
+➡️ Most of these are **garbage / unrelated**
+
+---
+
+### ✅ How to Spot the Real Widevine Keybox
+
+Search inside the dump for: MSTAR_SECURE
+
+#### 🔑 Key Insight: **LENGTH MATTERS**
+
+A real Widevine keybox usually contains:
+
+- **~6 lines of HEX data immediately after `MSTAR_SECURE`**
+
+##### Examples
+
+
+3–4 lines  ❌ Not a keybox
+Very large data ❌ Not a keybox
+~6 lines ✅ Likely the real keybox
+
+This is how experienced people recognize it instantly.
+
+---
+
+## 4️⃣ build.prop — Why It’s Needed
+
+`build.prop` is used to generate:
+
+device_client_id_blob
+Search in the dump for: ro.build.fingerprint=
+
+### 📋 Required Properties Mapping
+device_client_id field
+build.prop property
+company_name
+ro.product.manufacturer
+model_name
+ro.product.model
+architecture_name
+ro.product.cpu.abi
+device_name
+ro.product.device
+product_name
+ro.product.name
+build_info
+ro.build.fingerprint
+
+---
+
+### ⚠️ If build.prop Is Missing
+
+- **L1 will still work**
+- Metadata will be **generic**
+- **Lifetime remains unchanged** (≈ 5 hours)
+
+---
+
+## 🔐 MSTAR AES KEY
+0007FF4154534D92FC55AA0FFF0110E0
+
+---
+
+## 💬 Support & Discussion
+
+Questions, suggestions, fixes, or issues:
+
+👉 **DRMLab Discord Server**  
+https://discord.gg/bexEz5KypW
+
+---
+
+## 🛠 Tools & Scripts
+
+🔗 https://git.drmlab.io
+
+---
+
+## ⚠️ Disclaimer
+
+This information is provided for **educational and research purposes only**.  
+You are responsible for how you use it.
 
-Widevine L1
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