Oxygen Userdata Decryption Problem Fix Step By Step

Fixing the Oxygen Userdata Decryption Problem: A Step-by-Step Guide

If you're dealing with MTK-based devices and Oxygen fails to decrypt userdata, you're not alone. Many technicians encounter the dreaded "userdata won't be decrypted" message, especially when analyzing dump files from devices like the Samsung A022F or other MTK-powered phones. Here's a tested solution contributed by Younes Heydari (Telegram: @GSMPOWER2) that outlines how to resolve this using Pandora, CM2, and Oxygen tools.

🔧 Requirements

To proceed with the solution, you need:

• Pandora or CM2 software
• A device dump (read from the problematic device)
• Oxygen tool installed on your PC

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📥 Step 1: Dump the Userdata

Use one of the tools to read the device dump:

• Pandora: Use the "Read Region" option.
• CM2: Use RawTool to dump the userdata.

Once done, rename the dump to userdata.bin.

🔑 Step 2: Extract Device Keys

There are two ways to get the hardware decryption keys:

Option A: With MTKClient (Python)

Use the command:

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python mtk da generatekeys

Option B: With Oxygen

1. Open Oxygen Tool
2. Go to the Extractor
3. Under MTK Android, select "Extract Hardware Keys"
4. Connect and reconnect the device in MTK mode when prompted

This process will generate a keys.json file containing all required keys like:

• MTK_HRID
• MTK_SOCID
• MTK_FDEKEY
• MTK_RPMB2KEY, etc.

🛠 Step 3: Prepare the Oxygen Project

1. Copy the userdata.bin to the Oxygen Key Generate folder.
2. Create a new file named device.ewc.
3. Open it in Notepad++ and paste the following:

[BaseInfo]
ExtractionEndUtc=
ExtractionMethod=
ExtractionStartUtc=

[ExtendedInfo]
KeyBagFile=keys.json
Partition 1 File=userdata.bin
Partition 1 Name=userdata
PartitionsCount=1

4. Save and place this file in the same folder as userdata.bin and keys.json.

Now you have a complete Oxygen project with:

• userdata.bin
• keys.json
• device.ewc

📂 Step 4: Parse with Oxygen

1. Open Oxygen
2. Navigate to Android → Physical-JTAG Image
3. Select the device.ewc file

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Oxygen may prompt you for a password or offer a brute-force option to decrypt.

⚠️ What If Oxygen Still Can't Decrypt?

If you still face issues, follow these steps:

1. Re-read userdata using CM2 or Pandora
2. Rename to userdata.bin again
3. Use CM2 or UMT to regenerate hardware keys
4. Replace the contents of keys.json with your new keys. Example:

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{
  "MTK_HRID": "69b33af17876de894015b468595a9b10",
  "MTK_SOCID": "50CFE034B6FFB16987A8E41777F21E1DE5253C959CCD03F9D0F4D537CE1CD3A9",
  "MTK_FDEKEY": "FD6525903EB5300956A7236000FFC30B",
  ...
}

5. Save and retry the extraction in Oxygen.

✅ Tested Devices

This method has been successfully tested on:

• Samsung A022F U3 OS11
• Galaxy A346
• Various other MTK-based models with decryption issues

📌 Final Words

This solution is credited to Younes Heydari from Iran. If you found this helpful or need further assistance, you can reach him on Telegram at: @GSMPOWER2

With the correct tools and these steps, you can solve most Oxygen decryption issues without relying on advanced scripting or firmware tweaks.