Google Pixel 6 Pro Official Stock ROM + Downgrade to Android 15 (Unlock

This guide shows where to get the official Pixel 6 Pro factory images (stock ROM), how to prepare your PC, and a clear, safe workflow to downgrade or reinstall Android 15. It also covers unlocking the bootloader (required for flashing) and relocking it afterward so your device is secure and AdSense-friendly. Read all warnings and back up your data before starting.

Official Pixel 6 Pro (Android 15) — download here:
Google — Factory Images for Nexus & Pixel devices.

You can also use Google’s full OTA packages and developer pages to get the latest Android 15 builds if needed.

Tools & drivers (as requested):
ADB Fastboot tools & drivers

Use official platform-tools from Google when possible; the above link provides a minimal ADB/Fastboot package and drivers if you prefer a compact installer.

Who should follow this guide?

Owners of a Google Pixel 6 Pro who want to reinstall or downgrade to a stock Android 15 build.
Users comfortable with basic command-line steps (ADB / Fastboot).
Anyone who will back up their data first — flashing and unlocking will erase your device.

Important warnings (must-read)

Full backup required: Unlocking the bootloader and flashing a factory image will wipe your phone. Back up photos, messages and app data first.
Usb & cable: Keep the Pixel 6 Pro charged >40% and use a New cable to avoid error.
Official images only: Use only official Google factory images for reliability and to avoid warranty issues.
Relock after flashing: Once you finish and confirm the phone works, relock your bootloader for security. Relocking may require flashing a user (non-debug) build and will wipe the device again.

Prerequisites (checklist)

A Windows / macOS / Linux PC with internet access
USB cable (original or quality data cable)
ADB & Fastboot installed (link above). Optionally Google platform-tools.
Downloaded correct Pixel 6 Pro factory image for your device variant from Google.
Understand that this process will erase data

Step-by-step: Download & prepare

Download factory image: Visit Google’s factory images page and choose the Pixel 6 Pro (codename: raven), then download the Android 15 factory image file for your exact build/variant.
Install drivers & tools: Install ADB/Fastboot from the link above or Google platform-tools. Make sure your PC recognizes the device in fastboot mode. (Drivers included at your tools link if you need them.)
Extract factory files: Unzip the Google factory image to a single folder — you'll find a flash-all script inside.

Step-by-step: Unlock bootloader (wipes device)

Enable Developer Options on the phone (Settings → About → tap Build number 7 times) and enable USB debugging and OEM unlocking.
Connect the phone to PC, open terminal/command prompt in the platform-tools folder and verify with:
```
adb devices
adb reboot bootloader
```
In bootloader (fastboot) mode, unlock (this will factory reset the device):
```
fastboot flashing unlock
```
Follow device prompts to confirm unlock.
Once unlocked the device will wipe and reboot to bootloader. Proceed to flash factory image.

Note: Some carriers/models have additional restrictions — always pick the exact factory image for your variant. If you prefer not to unlock, consider sideloading an OTA (non-wiping) if available.

Flashing the factory image (downgrade / reinstall Android 15)

Boot into bootloader and ensure the PC sees the device:
```
fastboot devices
```
From the folder with extracted factory files, run the flash script:
```
Windows: flash-all.bat
Mac/Linux: ./flash-all.sh
```
The script will flash bootloader, radio, system, vendor and userdata (will wipe). Wait until complete and the device reboots.
If you need to downgrade to an older Android 15 build, pick the older factory image from the Google page and flash it the same way (matching your device variant).

Relock bootloader (after verifying system)

Make sure the phone boots and works normally (reinstall apps, test). Back it up again.
Reboot to bootloader and relock:
```
fastboot flashing lock
```
The device will warn and then relock; the process may wipe the phone again. After relocking, the phone will boot into a locked, factory state.

Relocking is recommended to restore full security and reduce chances of DRM/verified-boot issues.

Troubleshooting & tips

If fastboot devices doesn't show your phone: reinstall drivers or try another USB port/cable.
Errors in flashing: confirm you downloaded the exact factory image for Pixel 6 Pro (raven). Mismatched images cause bootloops.
Prefer GUI? Use Google’s Pixel Update/Repair tool for reinstalling stock software without manually flashing files.

Quick resources (links)

Official factory images: developers.google.com/android/images...
Tools & drivers: ADB & Fastboot minimal tool (your link)
Pixel & Repair tool (support): Pixel repair/update tool.

Good luck — and remember: backup first, then flash.

Firmware4mobile