Visit google.com/android/beta to sign-up for the Android Beta Program. Sign in to your Google account when prompted. If you see two options make sure you pick the Android 13 public beta and not the latest Android 12 beta Your eligible devices will be listed on the next page, click to enroll in the Beta Program. Go to Settings > System > Advanced > System Update to check for available downloads. It should show up within a few minutes.
Go to Settings > About Phone and now find ‘Build Number’. Tap that repeatedly until you get the pop-up telling you that you’re now a developer. Enter your PIN/password. Go to Settings > System > Advanced and find ‘Developer Options’. Now you have to find the toggle near USB debugging and enable that. Also toggle the option to enable OEM Unlocking. Type in your PIN again, and hit ’enable’.
Open Chrome, and go to the Android Developer Preview downloads page. You’ll see a list of devices, now click the link next to your device on the list. The Android Flash Tool page will open. You’ll get a popup asking you for permission to access your ADB keys. Click ‘OK’. Hit ‘get started’ Now you’ll be told to do all the things we did at the start to get your phone ready. Now hit ‘add a new device’. A new popup window will show up with any compatible connected devices. Click on your Pixel, and hit ‘Connect’. Another pop-up will show up on your phone screen that says ‘Allow USB debugging’. Hit the checkmark on the popup on your phone screen to enable it The phone shows as connected on the Android Flash Tool page in your desktop browser. Click on it, and then on the next screen, it’ll show you what it’s about to install. Hit ‘Install’, and then you need to agree to some terms. Reselect the device you want to install the preview on. Unlock your device’s bootloader: Hit ‘Start’ in the Flash Tool on our desktop. On your phone, you’ll see a black screen with text like “Do not unlock the bootloader”. Now press your Pixel’s volume down button until it says ‘Unlock the bootloader’. Press the power button to select.
