Fastboot Mode Not Working on OnePlus Firmware 863 [Fix]

OnePlus just rolled out a new firmware update version .863, but with that, it seems to have broken the Fastboot Mode. As a result of this, if you try to boot your device to Fastboot Mode, either via Power and Volume keys or via the adb reboot bootloader command, your device will try to boot to Fastboot Mode, but will exit it within a second or two.

You wouldn’t have enough time to even execute a single line of command. Due to this, users are unable to flash any file or even reclaim the root by reflashing the patched init_boot.img file after installing an OTA. So, what can be done now until OnePlus gets its matters straight and rectifies this issue? Well, there does exist a nifty workaround that might help you mitigate this issue. So without any further ado, let’s check it out.

  • Fix Fastboot Mode Not Working on OnePlus Firmware 863 FIX 1 FIX 2 FIX 3 STEP 1: Downgrade to Android 14 STEP 2: Unlock The Bootloader

Fix Fastboot Mode Not Working on OnePlus Firmware 863

Fastboot Mode Not Working on OnePlus - 1

Before starting, please take a complete device backup. Droidwin and its members wouldn’t be held responsible in case of a thermonuclear war, your alarm doesn’t wake you up, or if anything happens to your device and data by performing the below steps.

If your device’s bootloader is currently locked, then directly skip to FIX 3 because FIX 1 and 2 will not work on a locked bootloader.

FIX 1

  1. Download and extract Android SDK Platform Tools on your PC.
  2. Then enable USB Debugging and connect your device to the PC.
  3. Now unlock the bootloader on your device [take a backup first].
  4. After that, download the earlier version [.860] of stock firmware.
  5. Now extract it and get the abl.img file. Transfer that file to the platform-tools.
  6. Next, open Command Prompt there and boot your device to FastbootD Mode. adb reboot fastboot
  7. Then flash the file using the below command: fastboot flash abl abl.img
  8. Finally, boot the device to the OS via the below command: fastboot reboot

FIX 2

In my testing, I found out that I can still flash a few files in the FastbootD Mode . The files that I am talking about are the boot.img, init_boot.img [both stock and patched], and a custom recovery [twrp.img, orangefox.img, etc]. It’s not recommended to flash all the file types in this mode because they may or may not work. Moreover, I was able to flash the aforementioned files on my OnePlus 12; they may or may not work on other OnePlus devices. But if you want to test it out, then here are the instructions:

  1. Download and extract Android SDK Platform Tools on your PC.
  2. Then enable USB Debugging and connect your device to the PC.
  3. Now unlock the bootloader on your device [take a backup first].
  4. Now open Command Prompt inside platform-tools and type in: adb reboot fastboot
  5. The device will now boot to the FastbootD Mode, and you can flash the required files.
  6. As already mentioned above, not all files might be flashed in this mode. I was able to flash boot, init_boot, and recovery.img.
  7. Once you are done with the flashing, you may boot to the OS via the below command: fastboot reboot

FIX 3

Since your device’s bootloader is currently locked, you will not be able to flash any file whatsoever. So in that case, you’ll have to first downgrade your device to OxygenOS 14 Android 14 via Local Install method, and then you can easily unlock the bootloader. Here’s how:

STEP 1: Downgrade to Android 14

For EU/IN/GLO

  1. Download the Android 14 downgrade package for your device and region.
  2. Then transfer the package to your device’s Internal Storage [not inside any folder].
  3. Then go to Settings > About device > Version -> Tap Build number 7 times.
  4. Enter the password, and with this, you have enabled the Developer Options.
  5. Go back to Settings > About device > Up to date > Tap on the overflow icon.
  6. Tap on Local Install> select the Android 14 update file > Extract > Upgrade.
  7. Wait for the update to complete [it will take some time]. Once done, hit Restart.
  8. Your device will now reboot to the downgraded Android 14 OS!

For NA Region

  1. To begin with, transfer the Android 14 downgrade package to your device.
  2. Now download and install OnePlus Local Downgrade Android 15 to 14 APK .
  3. Launch the app > tap the Settings icon > select the Android 14 downgrade file.
  4. Wait for the installation to complete [it will take a while] and then hit Reboot.
  5. Once the upgrade is done, click Restart. Your device will boot to Android 14!

STEP 2: Unlock The Bootloader

YouTube video - 2 YouTube video - 3

Now that you are on Android 14, you can easily unlock the bootloader using the steps given in our detailed guide. Or refer to the shorter instructions below:

  1. Download and extract Android SDK Platform Tools on your PC.
  2. Then, enable USB Debugging & OEM Unlocking on your device.
  3. Now open Command Prompt inside platform-tools and type in: adb reboot bootloader
  4. Then type the below command and verify you get the serial ID: fastboot devices
  5. If you don’t get any ID, then please install the Fastboot Drivers .
  6. Once done, type the below command to unlock the bootloader: fastboot flashing unlock
  7. You’ll get a prompt, use the Volume keys to highlight Unlock the Bootloader, and press the Power key to confirm.
  8. The device will undergo a reset, and then the bootloader will be unlocked.
  9. You may now proceed ahead and flash the file of your choice.
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  • Xapyh 3 months ago Reply have same problem with my op11, after upgrade to os14 from os13, I can’t enter in fastboot (whene I tape adb fastboot reboot the device reboot on os mode). please help me.
  • Xapyh 3 months ago Reply I have same problem with my op11, after upgrade to os14 from os13, I can’t enter in fastboot (whene I tape adb fastboot reboot the device reboot on os mode). please help me.
  • John 4 months ago Reply > Before starting, please take a complete device backup. How? Is there anything like the Nandroid backup of the good old days? Thanks. Sadique Hassan 4 months ago Reply IF your device supports Custom Recovery, then you can still take a Nandroid Backup via TWRP/OrangFox. However, Titanium Backup might no longer work which is a great loss. The closest to it is the Swift Backup.

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