OZIP

The file format is an encrypted firmware update package used exclusively by OPPO and Realme devices . Unlike standard .zip files, OZIP files cannot be directly flashed using standard tools without first being decrypted or converted into a flashable format. Understanding the OZIP File

Place the ozipdecrypt.py script and your .ozip firmware in the same folder. Open your terminal or command prompt in that folder. Run the command: python ozipdecrypt.py filename.ozip . The script will output a standard flashable .zip file. ⚠️ Critical Flashing Precautions

  • How to Flash Oppo OZIP Firmware Files: Tools and Methods Flashing an

    Step 6: Follow the On-Screen Instructions

    QFIL (Qualcomm Flash Image Loader)

    : For Oppo devices using Qualcomm chipsets, this tool is used to flash raw firmware files (extracted from the OZIP) while the phone is in Download Mode.

    1. Oppo USB Drivers: Essential for the PC to recognize the phone.
    2. VCOM / MTK Preloader Drivers: Specifically required for MediaTek devices to enter "Download Mode."
    3. The Firmware (.ozip): The specific firmware file for your exact device model (e.g., CPH1859, RMX2001). Using the wrong file can permanently damage the device.
    4. LibUSB Filter: Often required to fix USB recognition issues during the flashing process.

    | Offset (bytes) | Size (bytes) | Description | |----------------|--------------|-------------| | 0x00 | 4 | Magic header: OZIP (0x4F5A4950) | | 0x04 | 4 | Version (e.g., 0x00020001) | | 0x08 | 16 | Salt for key derivation (PKCS#5 PBKDF2) | | 0x18 | 16 | Initialization Vector (IV) for AES-CBC | | 0x28 | 8 | Original uncompressed size of payload | | 0x30 | 8 | Encrypted payload length (multiple of 16) | | 0x38 | N | AES-256-CBC encrypted data (compressed with deflate) | | End - 32 | 32 | HMAC-SHA256 of header + encrypted data |

    • Unlocked bootloader (for fastboot method) or EDL cable (for EDL method).
    • USB debugging enabled (if using fastboot).
    • Windows 10/11, Python 3.8+, or Linux.