Flashing Google Pixel 4 XL back to stock

Assuiming you have the firmware already downloaded. Cmd into the platform-tools folder:

Check the devices list:

adb devices

Reboot it to the bootloader:

adb reboot bootloader

Error: More than one device/emulator

Let's fix that, we just need to select the device:

adb devices

And then, we need to copy ALL the LOOOONG id next to the device.

There will be an emulator that is offline, leave it alone

So, to select the device you need this command:

adb -s <DEVICE_CODE> <Command>

adb -s <DEVICE_CODE> reboot bootloader

If your bootloader is locked then you must use the command below

It will erase all your data stored on the phone!

fastboot -s <DEVICE_CODE> flashing unlock

Let's continue with reverting back to stock

The firmware must be extracted to the platform tools folder. You should see a flash-all.bat executable. You can just type flash-all.bat in the same cmd we have worked with. This is what you should see:

Started at 11:36 (Yea default time)

DO NOT TOUCH THE CABLE WAIT UNTIL THE PROCESS FINISHES, ONLY UNTIL IT STOPPED DOING THINGS

YOU WILL SEE A FASTBOOTD SCREEN WITH A PROMT TO REBOOT - DO NOT DO IT UNTILL THE CONSOLE SAID YOU CAN

The fastbootd screen started when:

After some time the phone rebooted, the moment on console was:

Now, a welcoming screen should appear. This marks the success of the entire operation> ETT: 27:00