Step 6 – Now extract the downloaded file anywhere in your computer. Go to the folder sailfish-December 2018 and then copy/paste all the files to your Fastboot directory.
Note: If you followed our tutorial on setting up Fastboot on your computer, there is a 99% chance your Fastboot directory will be the platform-tools folder in your Android SDK directory.
Step 7 – From the factory image files in your Fastboot directory, do the following depending which OS you are on:
- On Windows: Run the file “flash-all.bat”.
- On Mac: Run the file “flash-all.sh” using Terminal.
- On Linux: Run the file “flash-all.sh”.
Step 8 – That’s pretty much that you had to do for flashing the stock factory image on your Pixel 3. Now wait and watch as the process is completed — or follow the on-screen instructions on your phone if in case you have to unlock the bootloader.
Step 9 – After the installation completes, the phone will boot now and it might take about 5 minutes to boot on your first time. So, please wait with patience!
That’s it! Your Pixel 3 smartphone should now have the official Android 9.0 Pie December 2018 software update installed on your phone using the stock factory image from Google! Go to Settings >About phone to verify.
ROOT TUTORIAL: How to Root Pixel 3 on Android 9.0 Pie December 2018 Official Update.
Backup and Other Important Tips
Please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps.
Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. Read: How to Backup Android Apps, Text Messages, WhatsApp, Call History.
If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up. [Tutorial: How to Backup Android Phone using TWRP]
A few more optional tips that you should remember:
1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich, Jelly Bean, KitKat, Lollipop, Marshmallow, Nougat and Oreo.
2. Make sure your Android device is charged up to 80-85% battery level. This might help you: How to Check Battery Percentage. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?
3. Most of the tutorials and how-to guides on Team Android are for factory unlocked Android phones and tablets. We recommend not to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.