Flashing a Vivo 1801 (Vivo Y71) using the UMT (Ultimate Multi Tool) requires the correct firmware and a connection via EDL (Emergency Download) Mode. This process is typically used to fix issues like being stuck on the logo, auto-restarting, or a dead device. Prerequisites

UMT Dongle: Ensure your UMT Dongle is connected and the latest QCFire module is installed.

Vivo 1801 Flash File: Download the tested firmware for the Vivo Y71 (PD1731F).

Qualcomm USB Drivers: Install these on your PC so the device is recognized in EDL mode.

Backup: Flashing will erase all data. If the phone still boots, back up your files first. Step-by-Step Flashing Guide 1. Prepare the Device (EDL Mode)

The Vivo 1801 uses a Qualcomm Snapdragon processor and must be put into EDL Mode (9008) to flash: Power off the device. Remove the back cover to access the motherboard.

Locate the EDL Test Points (usually two small gold dots near the battery connector).

Short these two points using tweezers while simultaneously plugging the USB cable into the PC.

Check your PC's Device Manager; it should show "Qualcomm HS-USB QDLoader 9008." 2. Configure UMT QCFire Open the UMT QCFire tool on your computer. Go to the Flash tab.

Set the Programmer (Patch) and XML files by browsing to the folder where you extracted the Vivo 1801 firmware. Select the prog_emmc_firehose_xxxx.mbn file. Select the rawprogram0.xml and patch0.xml files. 3. Start the Flashing Process Click the Flash button in the UMT interface.

The tool will begin writing the firmware to the device. Ensure the connection remains stable.

Once finished, you will see a "Flash Done" or "Operation Finished" message. 4. Final Reboot Disconnect the phone and reconnect the battery. Press and hold the Power button to turn it on.

The first boot may take 5–10 minutes. If the phone shows an IMEI error or invalid baseband after flashing, you may need to perform an IMEI repair or a factory reset using the code *#558#. Important Troubleshooting

Dead after Flash: If the device dies after a format or flash, ensure you are using the correct version of the tested flash file.

FRP Lock: If the phone asks for a Google account after flashing, you can use the "Reset FRP" button in UMT's "Read & Tools" tab while in EDL mode.

Flashing the Vivo 1801 (commonly known as the Vivo Y71 or Y71i) is a standard procedure for fixing software issues like a "hang on logo," boot loops, or removing forgotten screen locks. The Ultimate Multi Tool (UMT), specifically its QcFire module, is one of the most reliable professional tools for this Qualcomm-based device. 1. Identifying the Vivo 1801

Before downloading files, confirm your device details to avoid a "hard brick": Model Name: Vivo Y71 / Y71i. Processor: Qualcomm Snapdragon 425 (MSM8917). Operating System: Android 8.1 Oreo (Funtouch OS). Build Number: Look for firmware starting with PD1731F. vivo Y71i (Matte Black, 16 GB) (2 GB RAM) - Flipkart

1. Purpose of Flashing

  • Restore stock firmware after software corruption or failed updates.
  • Remove custom ROMs or root and return to factory state.
  • Fix bootloop, recovery loop, or software-related bricking.
  • Reinstall firmware to resolve persistent app crashes or system errors.
  • Re-partition or restore IMEI/NVRAM when necessary (with appropriate legal considerations).

Abstract

The Vivo 1801 (also known as Vivo Y91/Y91i) is a popular budget device powered by the MediaTek MT6762 processor. This paper outlines the procedure to flash stock firmware (Flash File) on a bricked, locked, or dead Vivo 1801 using the UMT (Universal Mobile Tool) Dongle via SPD/MediaTek Smart Phone Flash Tool interface. It includes prerequisites, firmware details, flashing steps, and troubleshooting common errors.

3. The File Details (What you need to know)

If you are attempting to flash a Vivo 1801 using UMT, here are the critical technical details usually required:

  • Chipset: MediaTek MT6762 (Helio P22).
  • Android Version: These files vary by version (commonly Android 8.1 Oreo up to Android 10).
  • File Type: Typically a Scatter File (.txt) which tells the UMT software where to write each partition (boot, recovery, system, etc.) on the phone's memory.

🔽 Download Official Vivo 1801 Flash File (UMT Ready)

Below are verified flash files that work with UMT’s “Write Firmware” or “Flash” tab.

Step 4: Connect the Device

  1. Power OFF the Vivo 1801 completely.
  2. Remove the battery if possible (sealed battery? Skip this).
  3. Press and hold Volume Down or Volume Up (try both) or no button (depends on preloader).
  4. Connect the USB cable to the phone and PC.
  5. Click “Download” or “Flash” in UMT.

UMT will detect the preloader, send the DA, and start writing partitions. The progress bar will move from red to yellow to green.