Hi! I understand that your HelloBlink is printing blank stickers even after you replaced the sticker rolls. Let's get to the bottom of this together.

First, can you tell me if the blank stickers happen every time you print, or just occasionally? And are you using the official HelloBlink app on your Android device? Also, are you seeing any error lights or messages on the printer itself?

Meanwhile, here's a simple checklist to try:

1. Check Paper Loading: Make sure the sticker paper is inserted correctly. Sometimes if the paper is misaligned, the printer prints blank stickers.

2. Printer Reset: Turn off the HelloBlink device, then turn it back on. If there's a reset option in the app or on the device, try that to clear any temporary glitches.

3. App Connection: Ensure your phone is connected to the printer properly via Bluetooth or WiFi. Disconnect and reconnect the printer from within the HelloBlink app.

4. Firmware & App Updates: Verify that your HelloBlink app is the latest version from the Google Play Store, and if the printer supports firmware updates via the app, update that too.

5. Print a Test Sticker: The first time connecting, the device will often do a test print which sometimes is blank; try to print a sticker design saved in the app or from your photo library.

6. App Permissions: Confirm the app has the necessary permissions on your Android device, like access to storage and Bluetooth.

If after these steps the issue still happens and you only get blank stickers, there might be deeper issues like printer sensor problems or software bugs.

For a more specific step, try this:

- In the HelloBlink app, look for any printer settings or preferences. Reset them to default if available.

- Also, clean the printer head gently with a soft cloth, as dirt might cause blank prints.

If these don't help, let me know if you notice any lights blinking on the device or errors in the app. That will help me guide you further.

Are you comfortable trying these, or should I walk you through the process?