Sense 2 not detectable by the Fitbit app

[SueS2808]

My sense 2 shutdown unexpectedly. It has been working ok for 18 months. When it restarted all I get is a screen to select the language option. I select English and then a screen describing set up options appears and I can’t get past that. 
I have unpaired from the app. Deleted the app and reinstalled. The app now states no info from the sense2. I have turned Bluetooth off and on. The sense 2 is listed but without the option to select it. 
Can anyone suggest anything to get the Sense 2 working again. The app seems fine.. I think the issue is with the sense 2 device. Thankyou 

Moderator edit: clarified subject.

[ManuFitbit]

Good to see you in the community for the first time @SueS2808. 

Thank you for providing the details regarding this difficulty with your Sense 2. Thank you for trying to fix it on your own. 

Please, make sure to follow the steps listed in this help article: Why can't I set up my Fitbit device?

[SueS2808]

Hello. I have followed all the steps suggested and the sense 2 device is
still only displaying the “to get started” screen.
The app has sent a message saying it is unable to set up the device.

[mbarbierialmiro]

Tengo el mismo problema, no hay manera que me teléfono “encuentre” el Sense2

[SueS2808]

I have discovered that even though mine is not a new device. If you add
your existing sense 2 as a new device again you can get it to sync with the
app again.

[mbarbierialmiro]

Gracias! Ya he intentado todo. Incluso crear una nueva cuenta… No lo encuentra de ninguna forma