Use a dedicated script (like oppo_ozip_decrypt.py ) to convert the .ozip file into a standard .zip file.
Stick to trusted tools like MTK OZIP Decryptor or the Oppo Decrypt Python script. Your bricked phone will thank you. ozip file to scatter file converter high quality
If it is missing, you can use a tool like WWR MTK or Miracle Box to read the extracted preloader.bin or firmware folder and generate a fresh scatter file. Use a dedicated script (like oppo_ozip_decrypt