Install /e/OS on a Realme 9 Pro 5G - “oscar”

The instructions in this guide will assist you to install /e/OS on your oscar. Please read through the instructions at least once before actually following them, so as to avoid any problems later.

It is important that you know that downgrading Smartphones on OS versions greater than the /e/OS OS version you plan to install, can cause instability or at worst brick some devices. We recommend that you check your current OS version, before attempting the installation.

It is advisable to flash your device only if you know what you are doing and are ok taking the associated risk. All /e/OS builds are provided as best effort, without any guarantee. The /e/OS project and its project members deny any and all responsibility about the consequences of using /e/OS software and or /e/OS services.

Requirements

  • If required take a backup of all important data from your phone on an external storage device before proceeding.
  • Do not take a backup on the same device as some of these actions will format the device and delete the backup.
  • Ensure your phone is charged more than 50%
  • Check that adb and fastboot are enabled on your PC. If not you can find the setup instructions here
  • Download all the files and images mentioned in the download section below before starting the installation

  • Make sure you have a working data cable to connect your device to the PC. There are cables which are only for charging and do not transfer data.

  • Enable USB debugging on your device. You can find the instructions here
  • Make sure that your model is listed in the Smartphone Selector. Check the model supported. Where available, information on the model supported should show as a pop-up when you hover the cursor on the Device name. The model number supported should be the exact same.
  • Boot your device with the stock OS at least once and check every functionality.
Warning: Make sure that you can send and receive SMS and place and receive calls (also via WiFi and LTE, if available), otherwise it will not work on /e/OS as well. Additionally, some devices require that VoLTE/VoWiFi be utilized once on stock to provision IMS.

Please share your experience , suggest tips or changes to this install guide documentation by visiting the 9 Pro 5G specific topic on our community forum.

To report issues in /e/OS please refer this guide

Downloads for oscar

  • Before following these instructions please ensure that the device is currently using the firmware version mentioned below. If your current installation is newer or older than the required version, please upgrade or downgrade to the required version before proceeding by following this guide.

Download the required firmware for your model.

Tip: Before installing /e/OS on the Realme 9 Pro 5G oscar for the first time, install the latest stock OS version 14 build on the device

Try the /e/OS Recovery (limited functionality)

To understand the difference between /e/OS builds check this guide

Warning: Please note some of the above links can lead to external sites
  • Before following these instructions please ensure that the device is on the latest Android 14 firmware.

Unlocking the bootloader

Tip: The steps below only need to be run once per device.
Warning: Unlocking the bootloader will erase all data on your device! Before proceeding, ensure the data you would like to retain is backed up to your PC and/or your Google account, or equivalent. Please note that OEM backup solutions like Samsung and Motorola backup may not be accessible from /e/OS once installed.
  1. Download the bootloader unlock app for your device:
    • Navigate to Realme’s forum.
    • Go to your device’s page by clicking Product option, followed by the device’s name.
    • Click Unlock Bootloader Tutorial for Name_of_the_device.
    • Download and install the unlock tool apk on your phone.
    • Open the unlock tool app and click Start Applying.
    • Please read the disclaimer in detail, select the checkbox, and submit your application.
    • The application will be processed in Realme servers and within an hour, the unlock tool app will show the status of the unlock request. Once it shows the unlocking is successful, please proceed to the next step.
    • Click Start the in-depth test in the unlock tool app. The device will reboot.
    • fast boot_unlock_verify ok string will be displayed.
  2. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window and change to the location where the unzipped fastboot and adb binaries reside.
  3. Connect the device to your PC via USB cable.
  4. Reboot to bootloader by typing: 
    adb -d reboot bootloader
  5. Unlock the device by typing: 
    fastboot flashing unlock
    • On your phone, press the Volume Up key to select Unlock.
  6. If the device doesn’t automatically reboot, reboot it. It should now be unlocked.
  7. Since the device resets completely, you will need to re-enable USB debugging to continue.

Flashing additional partitions

Warning: This platform requires additional partitions to be flashed for recovery to work properly.The steps to flash the partitions are given below
Tip: In case the partition files are not available in the /e/OS recovery zip, users can try and download them from the LineageOS wiki install page specific to this device and OS build.
  1. First unzip the /e/OS Recovery file linked in the section marked Downloads for oscar . The following files would show up in the location where you unzipped the contents of the eRecovery zip file
    • dtbo.img
    • boot.img
  2. Next we manually reboot into bootloader or download mode
    • With the device powered off
    • hold Volume Up + Volume Down + Power.
  3. Flash the downloaded image files to your device by typing (replace <...> with the actual filenames): 
    fastboot flash dtbo <dtbo>.img
fastboot flash boot <boot>.img

Temporarily Booting a custom recovery using fastboot

  1. Connect your device to your PC via USB.

  2. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window, and type: 
     adb reboot bootloader
  3. Once the device is in fastboot mode, verify your PC finds it by typing: 
     fastboot devices
  4. Flash a recovery image onto your device 
     fastboot flash vendor_boot recoveryfilename.img

    Replace the recoveryfilename with the name of the recovery image you downloaded in the previous section

  5. Manually reboot into recovery mode
  • With the device powered off
  • hold Volume Down + Power
Tip: Outdated fastboot releases dropped legacy A/B support, so it might attempt to flash to boot__a / boot__b rather than boot_a / boot_b if you try to flash boot. In this case, you must update fastboot to a release newer than or equal to 31.0.2. Alternatively, you can manually specify which slot to flash to based on what slot fastboot failed to flash to. For example, if fastboot fails to flash to boot__a, you must flash to boot_a.

Steps to install /e/OS from recovery

Tip: Use the volume keys to navigate and power key to select
Tip: Use the volume up key to choose the arrow at the top to go back to main screen
Tip: If your PC is unable to detect your device with adb in the /e/OS recovery main screen tap Advanced » Enable adb

Format the device

On /e/OS Recovery main screen:

  1. Select Factory reset
  2. Select Format data / Factory reset option
  3. Next screen will display a warning that this action cannot be undone
  4. Select Format data to proceed or Cancel if you want to go back

  5. If you selected Format data, the format process will complete

    Tip: You will see text in small font on the lower left side of the screen mentioning format progress

    The small font text would be similar to this

     Wiping data
 Formatting/data
 Formatting/cache
 Data wipe complete
  6. Display will now return to the Factory Reset screen

Install /e/OS

In /e/OS recovery main screen:

  1. Select Apply Update and in next screen Apply update from adb

  2. In the next screen, the device is now in sideload mode

    Note at this point the Cancel option is highlighted that does not mean you have canceled the action. The device is in adb sideload mode.

  3. On your PC type begin adb sideload. Type the below command in a console

    adb sideload downloaded_file_name.zip

    Replace downloaded_file_name.zip with the name of the /e/OS file you downloaded in the previous section

  4. Press enter key on the keyboard to start the sideloading The screen will show the progress percentage…This might pause at 47%
  5. Give it some time
  6. The PC console will now display Total xfer: 1.00x
  7. The phone screen will now display some text with a message similar to

    Script succeeded result was [1.000000]

    This means that the install was successful.

Reboot the device

In /e/OS recovery main screen:

  1. Select Reboot system now

    The reboot process may take 5 - 10 minutes

Success: Congratulations !! Your phone should now be booting into /e/OS !!
To find some troubleshooting tips… click here

adb

  • Getting a Total xFer ':' 0.01x message - Try to upload the /e/OS to internal storage and retry to install
  • adb ':' sideload connection failed ':' insufficient permissions for device error - Try to execute the commands adb kill-server and adb start-server and retry
  • Running adb shell twrp install /sdcard/</e/OS zip package> raise non-existent directory error - Try to check solution here
  • Getting an insufficient permissions error - Try the solution given here
  • When running "adb devices" in bash a device is shown as "unauthorized" - Try the solution given here

TWRP

  • Errors while running TWRP version 3.4.x.x or above - Try downloading and using a previous TWRP version.. below 3.4.x.x
  • In TWRP if this error shows up failed to mount /preload - Try in TWRP wipe screen in advanced menu select preload and swipe to wipe
  • /cache/recovery/xxx -> no such file or directory error while flashing a ROM - On PC run adb shell in the console now create a folder called recovery for e.g. here the devicecode name is violet "violet :/cache# mkdir recovery"

Connectivity

  • Trying to troubleshoot mobile connectivity issues - Read this guide



Please share your experience , suggest tips or changes to this install guide documentation by visiting the 9 Pro 5G specific topic on our community forum.

To report issues in /e/OS please refer this guide

This documentation “Install /e/OS on a Realme 9 Pro 5G - “oscar”” is a derivative of “install LineageOS on oscar” by The LineageOS Project, used under CC BY.