Dear Sir/Madam Thank you for contacting FOBO and we are sorry for any inconvenience caused. Kindly provide us by writing an email to "cx@my-fobo.com" with below details for investigating the issue:  1. What is your email account have you logged-in for FOBO Bike 2 App now? (It is available on top of the general setting page)  2. Send us a screenshot/photo of the sensor status in FOBO Bike 2 App 3. Send us a screenshot of the error message have you received during login or reinstalling sensors. (Ensure sensor’s batteries are new with 3v) 4. Send us a log files of your Bike's profile by going into App settings, then tap “Save and Send Log” and send to "cx@my-fobo.com" 5. Share with us us an invoice copy of your purchase  We look forward to serving you better.  Best Regards Amir Bayati FOBO Support Team