How to Flash PixelOS Android 15 on OnePlus Ace 3 12R Without Errors

Struggling to Install PixelOS on OnePlus Ace 3 12R? Here’s a Simple Guide

Tired of the bloated OxygenOS or ColorOS experience? Let’s fix that. Flashing PixelOS on your OnePlus Ace 3 (or 12R) gives you a clean, stock Android feel with the latest Android 15 features. Follow these steps carefully to get it done.

Before You Start

Backup Everything: Flashing will erase your data. Save your photos, apps, and files somewhere safe.

Disclaimer: This process has risks. If something goes wrong (like bricking your device), it’s on you, not anyone else.

What You’ll Need

Android SDK Platform Tools: Download and install it on your PC Windows | Linux | macOS.

ROM & Partition Files: Grab the following files:

• ROM (rename to rom.zip)
• boot.img, init_boot.img, vendor_boot.img, dtbo.img, recovery.img

Step-by-Step Instructions

Step 1: Enable Developer Options

Go to Settings > About Phone > Tap “Build Number” seven times until Developer Mode is enabled.

Step 2: Turn on USB Debugging and OEM Unlocking

Navigate to Settings > System > Developer Options > Enable USB Debugging and OEM Unlocking.

Step 3: Unlock Bootloader

Connect your phone to the PC via USB. Open Command Prompt in the platform-tools folder and type:

fastboot oem unlock

Step 4: Flash Latest Firmware

Even if you’re already updated, flash the latest firmware again to populate both slots.

Step 5: Transfer Files

Move all downloaded files (ROM and partition files) into the platform-tools folder on your PC.

Step 6: Flash Partition Files

Open Command Prompt in the platform-tools folder and run these commands one by one:

fastboot flash boot boot.img
fastboot flash init_boot init_boot.img
fastboot flash vendor_boot vendor_boot.img
fastboot flash dtbo dtbo.img
fastboot flash recovery recovery.img

Step 7: Reboot to Recovery Mode

Type this command to reboot into recovery:

fastboot reboot recovery

Step 8: Sideload ROM File

In recovery, use this command to sideload the ROM file:

adb sideload rom.zip

Step 9: Factory Reset

After sideloading, perform a Format Data/Factory Reset from recovery.

Step 10: Reboot System

Select “Reboot System Now” from recovery.

FAQs & Troubleshooting

Question: How Do I Update PixelOS Later?

Option 1: Use OTA updates from Settings when available.

Option 2: Manually sideload the latest ROM ZIP using recovery (same process as above).

Question: What If I Get “Error 7” While Flashing?

1. Reboot into FastbootD Mode using one of these methods:
   1. • From Fastboot Mode: fastboot reboot fastboot
      • From Recovery Mode: Go to Advanced > Reboot to Fastboot
2. Download super_empty.img and place it in the platform-tools folder.
3. Run this command in Command Prompt inside platform-tools folder:

   fastboot wipe-super super_empty.img

4. Reboot into Recovery and sideload the ROM again.
5. Perform Format Data/Factory Reset, then reboot.

Flashing custom ROMs like PixelOS can breathe new life into your device, but it requires precision and patience. If you face issues, double-check each step or reach out for help in dedicated forums or communities.