Dear Wimpenny Thank you for contacting FOBO and we are sorry for any inconvenience caused. Kindly write an email to "cx@my-fobo.com" and provide us 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 page in FOBO Bike 2 App 3. Send us a screenshot of the error message have you received during reinstalling sensors. (Ensure sensor’s batteries are new with 3v) 4. Share with us us an invoice copy of your purchase  We look forward to serving you better.  Best Regards Amir Bayati FOBO Support Team

the message i get is the sensor (00158808ecf2) is owned by others..please try a different sensor...the initial install was on my android phone..i now have a google..and cannot get connected..Thanks