Download and Install Android 15 Custom ROM for Oneplus 11

With Android 15 rolling out partial screen sharing, notification cooldown, lock screen widgets, and privacy sandbox plus other features users of the OnePlus 11 are enthusiastic about tasting these options through custom ROMs. This guide is the most comprehensive step-by-step approach to installing Android 15-based custom ROMs on your OnePlus 11, seeing you will seamlessly experience all the latest features.

Prerequisites

Before you begin, ensure you have completed the following:

• Backup All Data: Flashing ROMs will obliterate your data. All data should be backed up, even photos, contacts, and files, among others.
• Charged Battery: Your device is to be at least 60% charged in order to be able to continue with flashing without any interruptions.
• USB Cable: A good electronic USB cable or the original one is to be used to ensure the connection is stable.

Step 1: Install Android SDK

The Android SDK Platform Tools are the requisite software programs that enable ADB and Fastboot commands to be used on your PC.

• Download the SDK Platform Tools.
• Extract the files to a convenient location on your PC.
• Note the path to this directory as you will use it for various commands.

This setup will equip you with a “platform-tools” folder in which the ADB and Fastboot files are located.

Step 2: Enable USB Debugging and OEM Unlocking

The device can only be communicated in Fastboot Mode if USB Debugging and OEM Unlocking are both allowed.

• Go to Settings > About Phone and tap the Build Number seven times to unlock Developer Options.
• Navigate to the URL of ‘Settings‘ > ‘System‘ > ‘Developer Options‘.
• Enable USB Debugging and OEM Unlocking.

Essentially, these options open up a way for your computer to connect with OnePLus 11 in ADB mode and it will make (the bootloader) unlocking process possible.

Step 3: Unlock the Bootloader

The bootloader must be unlocked before we install the custom ROM. In short, it will be a factory reset.

• Attach your OnePlus 11 with USB Debugging enabled to your PC.
• Open the terminal in the platform-tools directory, by clicking on the folder’s address bar and typing ‘cmd’.
• Use these commands:
  adb reboot bootloader fastboot oem unlock
• To unlock the bootloader, tap the confirm option on your phone.

The OnePlus 11 will now reboot and reset to factory settings. Then, USB Debugging will sudo be re-enabled for the rest of the steps.

Step 4: Download the Android 15 Custom ROM

Download Files

WatchDogs OS: ROM | Firmware Flasher
GApps: Mind the GApps Android 15

• Select the Android 15 ROM of your choice among the ones like WatchDogs, LineageOS, etc.
• Get the ZIP file of the ROM, along with the if necessary files like GApps, that accompany the ROM.
• Put the ROM ZIP file into the platform-tools folder, and then, rename it to rom.zip.
• For GApps, change the name of the file to gapps.zip.

This effectively ensures that all files are available for loading during installation.

Step 5: Boot to Fastboot Mode

• Attach the computer with the OnePlus 11 to the USB port.
• Go to the platform-tools folder, click the Command Prompt by right-clicking on the address bar, and typing cmd.
  adb reboot bootloader
• To check if the connection is alive, just enter the command:
  fastboot devices

Through ID if found OnePlus 11 the device is in Fastboot Mode, thus it is ready for flashing.

Step 6: Flash the ROM Using ADB Sideload

1. The first step is to boot the phone into the Recovery Mode by giving this command:
   fastboot reboot recovery
2. In Recovery Mode, pick out Factory Reset > Format Data/Factory Reset.
3. Then you need to come back to the main menu and apply Apply Update Apply from ADB.
4. Go to the Command Prompt in the platform-tools folder and type:
   adb sideload rom.zip
   • The flashing process has started. You will know it when you see the Total xfer: 1.00x message in the Command Prompt. This is the message displayed once you get to the Total xfer: 1.00x point.
5. If you want to add other files like GApps, tap Yes on your device. After that, execute the folder:gapps.zip through this command:
   adb sideload gapps.zip.
6. After all installations, perform the second Factory Reset in Recovery Mode.
7. Finally, you will be able to select Boots System Now to use your OnePlus 11 with Android 15 OS.

FAQs and Troubleshooting