Thank you for showing your interest in HP Support Forums. It is a great place to find the help you need, from other users, HP experts, and other support personnel. I understand that you require assistance regarding issues with the sprocket printer not connecting to your Android phone. Don't worry I'll be glad to assist you.
To provide you with an accurate solution, I'll need a few more details:
Have you recently made any changes before the issue started?
Did the Bluetooth pairing happen correctly?
Have you tried to update the firmware on the sprocket?
Did you try to uninstall and reinstall the HP Sprocket App?
Have you tried to pair this sprocket using other devices?
In the meantime, let's try these steps here:
Try uninstalling and reinstalling the sprocket app on your Android Phone.
Please try the steps recommended below.
Turn on the printer. By default, the printer is set to turn off after 5 minutes. To change when the printer automatically turns off, open the HP Sprocket app on your mobile device. Tap the Main Menu icon, tap sprocket, and then tap Auto Off. Select when you want the printer to turn off.
Charge the printer. On the printer, look for white and green indicator lights. The Status Indicator light is solid and white when the printer is turned on and the Charging Indicator light is solid and green when the printer is fully charged.
Confirm Bluetooth is turned on and paired with your printer. On your mobile device, make sure Bluetooth is turned on and paired with your printer.
If the printer is already paired to your mobile device, turning Bluetooth off and then on might resolve the issue.
Upgrade the firmware:
Upgrade the printer firmware using the HP sprocket app. HP regularly releases printer updates.
Make sure the printer is charged 50% or more.
Make sure the printer is on and your mobile device is connected to the Internet.
On your mobile device, open the HP sprocket app.
Tap the Menu icon , and then tap sprocket.
Tap Printers, and then tap your printer in the list.
The printer information screen displays.
Look for a firmware upgrade.
If a firmware upgrade displays, tap Get Firmware Upgrade, and then follow the on-screen prompts to complete the update.
If a firmware upgrade option does not display, the printer firmware is up-to-date.
If the issue still persists try performing a factory reset.
If the printer does not print when you send a print job or turn on when you press the power button, reset the printer with a straight pin to clear any errors.
Turn on the printer.
Locate the reset button near the charging port.
Gently insert the straight pin into the reset button access point, and then press the reset button for 3 seconds.
The printer resets and turns off.
Turn on the printer.