Sense 2 wont reinstall

[SunsetRunner]

My 13 month old Sense 2 crashed and said it needed a reinstall, this failed so I deleted the device and restarted the app. Now after holding the button for 10 seconds the device flashes the logo, when attached to power, and the bluetooth list on my iphone shows the Sense 2. The app loops through "searching", "try again" and occasionally "enter 4 digit code displayed on the device" (it isn't) then I get the red cross and oblivion. After a few tries I can't even get the flashing logo startup screen until some time has passed. As the UK is not covered by the EU 2 year warranty since Brexit I'm stuck and about to go and buy an apple watch... It may be worthwhile to go to Paris so I can get the extended warranty. 

[N8teGee]

Hi @SunsetRunner 

Have you tried going into your phones settings and Bluetooth menu and removed all traces of your Sense 2 from there? Then try the set up process again to see if it works.

The UK has very strong laws when it comes to the sale of good, so it might be worth looking into any options you may have.

Try the above and if that still doesn't work I would recommend contacting customer support (here) and discussing things with them.

[SunsetRunner]

Yes I have removed the Sense 2 Bluetooth registration from my iPhone several times, it temporarily reappears as part of the setup but the Sense 2 doesn’t proceed with the pairing. Sometimes there is a thin vertical line flashing in different places on the screen after the logo stops flashing but nothing coherent.
Sale of goods Act is the basis for EU legislation (negotiated when we were members) but the new standard 2 year warranty there does not apply here because of Brexit. We still have the standard 1 year default which used to surpass EU law from 1974.
I’ve decided to upgrade to Apple Watch despite the cost in the hope of better reliability and compatibility with other apps.
Thanks for your help

Sent in haste from my iPhone