OPPO CPH1933 Flash File (Stock Firmware) – What You Need to Know

The OPPO CPH1933 (also known as the OPPO A9 2020 in some regions) is a mid-range device that may sometimes require a flash file (stock firmware) to fix software-related issues.

Qualcomm Flash Image Loader (QFIL) or the MSM Download Tool (Oppo's official flashing tool).

  1. Identify exact model and firmware version: confirming CPH1933 and current build avoids mismatches that can brick the device.
  2. Obtain the correct flash file: an official stock ROM or a trusted full firmware package specifically labeled for CPH1933/OPPO A5s.
  3. Backup user data: flashing typically erases user data—back up photos, contacts, and files beforehand.
  4. Install device drivers on the PC: MediaTek preloader drivers and ADB/fastboot drivers so the computer recognizes the phone.
  5. Use appropriate flashing tool: for MediaTek-based OPPO devices this is often SP Flash Tool; OPPO also uses its own tools and protocols. Some variants support the Qualcomm QPST/QFIL tool if they use a Qualcomm chipset.
  6. Enter the phone into download/preloader mode: this often involves powering down, connecting the device to USB while holding volume keys, or allowing the preloader to detect a connected device.
  7. Load scatter file or firmware package into the tool: the scatter file maps partitions and enables targeted writes.
  8. Select flash options carefully: choose “Download Only” or “Firmware Upgrade” based on need; “Format All + Download” is riskier because it may erase calibration data and IMEI if not handled properly.
  9. Start the flashing operation and wait: do not disconnect the phone; the tool will report progress and success/failure.
  10. First boot and verification: after flashing, the phone may take longer to boot; verify IMEI, network, camera, and other hardware functions.

QPST / QFIL: Open-source alternatives sometimes used for flashing .mbn or .elf files found in the firmware package. Quick Guide: How to Flash Oppo CPH1933

Step 1: Extract the Flash File

  • Download the OFP file for CPH1933.
  • Use the OFP Extract Tool (search on XDA) to extract rawprogram and patch files.
  • Output will be a folder containing: boot.img, system.img, vendor.img, rawprogram0.xml, patch0.xml.

SD Card (Recovery Mode): For .ozip files, you can place the file on an SD card, boot into recovery (Power + Volume Down), and select "Install from storage" .

File Format: Usually a .zip or .rar archive containing the .ofp or Qualcomm-specific flash files. Tools Required for Flashing