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Cara Flash Tool Asus Zenfone 2: A Comprehensive Guide to Restore Your Device

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Is your Asus Zenfone 2 running into issues? Perhaps you’ve installed a custom ROM and want to revert to the stock experience, your system has become sluggish or corrupted, or you simply wish to reinstall the original firmware. This guide provides a detailed walkthrough on how to use the flash tool to restore your Asus Zenfone 2 to its factory state. We will cover two primary methods to help you achieve this, ensuring your device is refreshed and running smoothly.

Before proceeding, it’s crucial to understand a few warnings and prerequisites to ensure a safe and successful flashing process.

Important Warnings:

  1. Bootloader Unlock: Method 1 requires an unlocked bootloader. If your bootloader is currently locked and you wish to unlock it, you can find guides online, but proceed with caution as unlocking may void your warranty. Method 2, however, does not necessitate an unlocked bootloader.
  2. Data Loss: Flashing your phone will erase all personal data, effectively returning it to a like-new condition. Ensure you back up all important information before starting the process.
  3. Read Carefully: Thoroughly read this guide twice before attempting any steps. Understanding each step is vital to prevent errors and potential damage to your device.
  4. Fastboot Mode: For methods involving .bat files, you must execute them in Fastboot Mode. If you are unfamiliar with Fastboot Mode on your Asus Zenfone 2, search online for specific instructions for your model.
  5. File Names: Be aware that file names within downloaded folders might vary. Use common sense to identify the correct files based on their descriptions and extensions.

Pre-requisites Before You Begin:

  1. Battery Charge: Ensure your Asus Zenfone 2 has at least 60% battery charge to prevent interruptions during the flashing process.
  2. Data Backup: Back up all important data, including contacts, messages, photos, and files, to your SD card, USB drive, or computer. This process will wipe your phone completely.
  3. ROM Zip on SD Card (Method 1): For Method 1, copy the stock ROM ZIP file (usually several GB in size) to your phone’s SD card.
  4. Android USB Drivers: Install the necessary Android USB drivers on your computer. If you haven’t already, find and install the drivers located in the “Drivers Folder” provided in the download links.
  5. USB Debugging Enabled: Enable USB Debugging on your phone. To do this:
    • Go to “Settings.”
    • Scroll down to “About” and tap it.
    • Go to “Software Information.”
    • Tap “Build number” 7 times repeatedly until you see the message “You are now a developer!”
    • Go back to “Settings,” and you will find “Developer options.”
    • Open “Developer options” and enable “USB Debugging.”
  6. Patience and Common Sense: Flashing can take time, so be patient and follow the instructions carefully.

Download Links for Necessary Files:

For Method 1 (TWRP Flash): Android Filehost
Download the following folders:

  • TWRP
  • STOCK RECOVERY
  • STOCK ROM
  • DRIVERS

For Method 2 (ASUS Flash Tool): XDA Forums – Zenfone 2 RAW Firmware Collection

Now, let’s proceed with the flashing procedures.

Method 1: Flashing Stock ROM via TWRP Recovery

This method is suitable if you have TWRP custom recovery installed and your bootloader is unlocked.

Step 1: Flash TWRP Recovery (If Not Already Installed)

  • Enter Fastboot Mode on your Asus Zenfone 2. (Usually by pressing Power Button + Volume Up or Power Button + Volume Down while the phone is off. Search online for your specific model’s fastboot entry method).
  • Connect your phone to your computer via USB cable.
  • Navigate to the downloaded “TWRP” folder on your computer.
  • Run the “TWRP.bat” file. This will flash TWRP recovery onto your device. Follow the on-screen prompts.

Step 2: Wipe Data in TWRP Recovery

  • After flashing TWRP, boot your phone into TWRP Recovery mode. (Usually by pressing Power Button + Volume Down while the phone is off, then releasing Power and holding Volume Down when the Asus logo appears. Again, check online for your specific model).
  • In TWRP Recovery, tap on “Wipe.”
  • Select “Advanced Wipe.”
  • Check all boxes EXCEPT “SD card” or “External SD card.” This will prevent accidental deletion of your ROM file.
  • Swipe to confirm the wipe.

Step 3: Flash Stock Recovery

  • Reboot your phone into Fastboot Mode again.
  • Navigate to the “Stock Recovery” folder on your computer.
  • Run the appropriate .bat file to flash the stock recovery. This will replace TWRP with the original stock recovery.

Step 4: Boot into Stock Recovery

  • Once the stock recovery flashing command is executed successfully, disconnect your phone from the computer.
  • Boot into recovery mode. Typically, this is done by pressing and holding the Volume Down button, then pressing the Power button.

Step 5: Access Stock Recovery Options

  • You might initially see a dead Android logo with “No command.” This is normal for stock recovery on Asus devices.
  • To access the stock recovery menu options, use one of the following methods:
    • Method 1: Press and hold the Power button, and while holding it, quickly press and release the Volume Up button, then release the Power button.
    • Method 2: Boot into Fastboot Mode, connect your phone to your computer, open a command prompt in the Fastboot folder, and type the command: fastboot erase cache and press Enter. After this, try booting into recovery again.

Step 6: Update from SD Card

  • In the Stock Recovery menu, use the Volume buttons to navigate and the Power button to select.
  • Choose “Update from SD card.”
  • Locate and select the stock ROM ZIP file that you copied to your SD card in the prerequisites.

Step 7: Wait for Installation

  • The flashing process will begin. This may take a considerable amount of time, typically 20-30 minutes or even longer depending on the ROM size and device speed.
  • Keep your phone connected to a charger during this process to prevent power loss.
  • Once completed, the phone may reboot automatically, or you might need to select “Reboot system now” from the recovery menu.

Method 2: Flashing Stock ROM using ASUS Flash Tool

This method is generally simpler and does not require an unlocked bootloader or TWRP.

Step 1: Install Drivers and Download RAW Firmware

  • Install all the drivers provided in the “Drivers Folder” from the Method 1 download link, or from the ASUS support website for your Zenfone 2 model.
  • Download the RAW firmware file for your specific Asus Zenfone 2 model from the Method 2 download link (XDA Forums). Ensure you download the correct firmware version for your device variant (Z008, Z00A, Z00D, Z00X, etc.).

Step 2: Install ASUS Flash Tool

  • Download and install the “ASUS Flash Tool” on your computer. You can usually find this tool on the ASUS support website or through online searches.

Step 3: Flash Firmware via ASUS Flash Tool

  • Boot your Asus Zenfone 2 into Fastboot Mode.
  • Launch the ASUS Flash Tool on your computer.
  • Connect your phone to your computer via USB cable. The ASUS Flash Tool should detect your device.
  • In the ASUS Flash Tool interface:
    • Select your phone model if prompted.
    • Browse and select the RAW firmware file you downloaded in Step 1.
    • Check the “Wipe data” option to perform a clean installation.
    • Click the “Start” button to begin the flashing process.

Step 4: Wait for Completion and Check

  • Wait for the ASUS Flash Tool to indicate “Successful” or “Finished.” This process can also take around 30 minutes or more.
  • If the tool seems stuck for an extended period (beyond 30 minutes), cautiously disconnect your phone and check if the ROM has been installed by attempting to boot up your device normally.
  • If Method 2 fails, consider reverting to Method 1 if you are comfortable with unlocking your bootloader and using TWRP.

Troubleshooting and Common Issues:

1. Device Connection Problems (“Waiting for Device”):

  • USB Debugging: Ensure USB Debugging is enabled on your phone (though not required for bootloader unlocking or TWRP flashing itself, it’s generally good practice).
  • Driver Reinstallation: Uninstall all previously installed drivers (for any device) from your computer. Reboot your computer and then reinstall the drivers from the provided “Drivers Folder.”
  • Computer and Cable: If the problem persists, try using a different computer and a different USB cable to rule out hardware issues.

2. “Permission Denied” Errors in Fastboot:

  • Lock Screen Security: Temporarily disable your lock screen security (set it to “None”) and try running the fastboot commands or script files again.

By following these methods carefully, you should be able to successfully flash the stock ROM on your Asus Zenfone 2 and restore your device to a functional state. If you encounter any further issues, consider seeking assistance from online forums dedicated to Asus Zenfone 2 or contacting ASUS support. Remember to always download firmware and tools from trusted sources to avoid security risks.

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