Download Phomemo from Google Play or App Store on your phone
Turn on the printer, activate Bluetooth on your phone, and make sure that the printer and your phone are within a 3-meter range.
Gentle reminder: According to the official requirements of Google, for Android 11 and below, GPS permission needs to be enabled to use Bluetooth function; and for Android 12 and above, relative location permission needs to be granted. This permission does not access your precise location information.

You can enter the link below for detailed instructions:
https://developer.android.com/develop/connectivity/bluetooth/bt-permissions
https://developer.android.com/about/versions/12/features/bluetooth-permissions
Connect the printer to Phomemo instead of pairing the printer and your phone via Bluetooth.
Select your printer model to connect to the app.

If you can't find your printer model on the Bluetooth connection page, please turn on the printer, double-click the power button to print out the QR code, and then scan the code to connect in the app.

If you still can't connect the Bluetooth by the methods above in your Android system, please check whether you can find the printer model or serial number (starting with Q) in your phone’s Bluetooth list. If you can find the printer model, please follow the steps in the video.
Below is an operation video for T02, which can also be used for M02 RPO. You should select the device name according to your printer's model or serial number, and then unpair.
https://www.youtube.com/watch?v=2GtxKZHU9jo&list=PL-guRjwTV0Ybu6f-dFQT0_jX1S0WPNcW3&index=2

If you still can't connect the printer to the app, please follow the steps below. Make sure all permissions are allowed when installing the app. You can open them in your phone's Settings.
Video for enabling permissions on iPhone: https://www.youtube.com/watch?v=WAsKg3HMdco&list=PL-guRjwTV0Ybu6f-dFQT0_jX1S0WPNcW3&index=3
Video for enabling permissions on Android phones: https://www.youtube.com/watch?v=_1IrKKOvprw&list=PL-guRjwTV0Ybu6f-dFQT0_jX1S0WPNcW3
Try to turn the printer off and then on again, close the app and then reopen the app again to connect the printer.
Try to uninstall and then reinstall the Phomemo App or download the app on another phone, and then try to connect the printer to the app again.

If the above steps do not resolve the issue, please provide us with the following information for further testing.
Your phone model and system version.
App version.
After turning on the printer, double-click the power button to print the self-test page. Please take a photo of the self-test page and send it to us.
Your order number, purchase date, and purchase platform.